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Go to a Jabber registration website. Enter a username. Select a suffix (if available). Enter your password and confirm it. Verify that you are a person. Click Register.
There are many websites that allow you to register a Jabber account.  The following are a couple of websites you can use to register an account:  https://www.xmpp.jp/signup?lang=en http://jabberes.org:5280/register/new https://jabb.im/reg/ https://jabber.hot-chilli.net/forms/create/  Note: Jabber.org has discontinued registration. Use the bar next to "Username" to enter your username. Your username can contain letters or numbers, but no special characters. Usernames are not case sensitive. The format for a Jabber address is Username@domain.extension (i.e. username@xmpp.jp).  Some registration websites allow you to select which domain name you want to use as your suffix in your Jabber address.  Others only give you one option.  If you have the option, use the drop-down menu next to your username to select a domain name you want to register to. There are two lines where you use to create a password.  Enter your password in the first line.  To confirm your password, type your password in the second line exactly as you did in the first line. Most XMPP registration websites have a tool to verify that you are a real person.  This may be a reCaptcha box that requires you to check the box that says "I am not a robot", or you may be required to enter characters you see in an image to register your account.  Follow the instructions to verify that you are a person. This registers your XMPP address with the server you selected.  Remember your username, address, and password.