A common mistake during login is accidentally having the Caps Lock key turned on. This situation can cause the login process to fail because usernames and passwords are case sensitive. If problems persist, re-enter your username and password a few times to ensure that you have typed them correctly.
Recovering the password for a user account is not a difficult process, but it is beyond the scope of this guide. You may wish to ask for help on user forums or chat rooms for further assistance.