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Look for the "choke" lever or cut-off switch.
For cold starting, there is usually a choke lever or "cut-off switch" on the handlebar. On some bikes, there may be a choke lever mounted on the carburetor. Operating this will provide the necessary rich fuel mixture when the motorcycle is "cold" – when it hasn't been used for more than a few hours. The dirtier the carburetor, or the colder the engine is, the more the choke will need to be engaged.  You don't need to use the choke lever when starting a motorcycle "hot." If the motorcycle has been running and the engine is already hot, you won't need as much power to get it going. Just use a small amount of throttle and the engine should fire.  Many bikes have a cut-off switch on the kickstand, so make sure that the kickstand is up as well. Having the bike in neutral will disable the kickstand shutoff.