If you can't log in, make sure you're doing the following and account is as follows:
making sure to log in with the username and password you signed up for
however if this username is really long or has spaces, or symbols, you'll have to make a new one
if your password has numbers or symbols (i don't advise this) make sure you're using the numbers above the letter keys, not the number pad.
can also try just changing your password