What website do I register to go online guitar hero 3 for pc? and where to find the license?

I do not know how to access the Internet at guitar hero 3 for PC, people say I have to sign up for a certain website but do not know that. also when playing the game and try to create a new account, where to find / obtain the license? Please help.

You do not sign anything. You just buy it where they sell all other games ——— PC game in stores.

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