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You need to make sure that people notice your attitude and one way to do that is to dress with the intent of showing how little you care, or by actively trying to piss people off.  Wear things your parents won't approve of like clothing that doesn't fit you right, has inappropriate slogans on it, or is dirty and ripped. Create your own style. You want to make sure people know that you don't care what they think about you and one way to do that is to be obvious about crafting your own style. Remember, you don't just want to wear all black to show your attitude (anyone can do that), you want to make yourself unique. Piercings and tattoos are all the rage with the rebellious and those who are trying to really piss their parents off. You will need to be over 18, however, to get a tattoo or piercing without parental consent, unless you go to an disreputable place (and that's bad for things like infections, so it's not recommended. Body language is the perfect way to communicate how you're feeling. Showing the proper amount of attitude means using the right body language, so that other people know what's up.  Cross your arms across your chest. While this is a defensive gesture, it can also be a gesture of irritation or boredom and can mean that you aren't interested in the person or persons you're with. Rolling eyes is a great way to express irritation or derision towards another person. Whatever they say make sure to roll your eyes, especially if you've gotten in trouble for breaking rules. Not making eye contact or making too much eye contact are good ways to show attitude. Not making eye contact can be really irritating to other people because it shows a lack of interest on your part. Making too much eye contact can be intimidating. Slamming doors and making a lot of angry noise (like playing angry music really loudly) can show your displeasure and disrupt everyone else's life. It's especially good to use this tactic after you've had an argument with an authority figure. Your room is your own personal realm and you get to rule it however you want, and that includes letting people (like your family) into it, when and if you choose to do so.  Yell at family members who try to come into your room. Put signs on your door that it'll be instant death for anyone who tries to come into your room without your express invitation. If someone knocks on your door, tell them to "go away!" Don't filter the things that you say. If they're rude, so what? You're looking to have an attitude and an attitude means not caring how the things you do and say affect others.  Point out the mistakes of others. When people screw up (especially adults like your parents or your teacher) make sure that you ridicule them for it. Say things like "Oh my god, mom, I can't believe you burnt dinner. Can't you do anything right?"  Speaking your mind is a great skill to cultivate and it is also one that will serve you well if you're copping an attitude. If someone is wearing a truly hideous outfit, make sure that you tell them so. If your friend is acting like an idiot over a boy, make sure that you mention it loudly. This is an important part of having an attitude, because the attitude comes from the belief that you are better than everyone else (hence pointing out mistakes, and shooting down suggestions). Act like people's time and energy belongs to you (especially people like your parents; definitely take them for granted).  Act like you know everything. When someone tries to change your mind or convince you otherwise, simply laugh at them or roll your eyes and walk away.  Never say "please" or "thank you." These are phrases that are way to polite and mannered for your attitude, so you'll want to avoid them at all costs. Never try to help out around the house and definitely don't try to give your teachers at school a hand, even with something simple like holding the door for them. You will want to make sure that you're hanging out with people who support your attitude, which basically means hanging out with people that your parents won't like or approve of; people who have as much attitude as you do.  You can easily find these people at school, as long as you cultivate an air of disinterest in them and in everything, they'll be dying to be friends with you. You definitely want to make sure that the people you're hanging out with are people who aren't going to tell on you to your parents that you stayed out past curfew or your teacher that you haven't done your homework all year.
Dress the part. Use the right body language. Don't let anyone into your physical space. Say whatever comes into your head. Have a sense of entitlement. Hang out with people your parents don't approve of.