If you are having trouble logging into the game, first verify your login credentials. You can do this here:
Simply click the 'Can't Login?' link and follow the steps to recover your username and/or password as necessary.
If you continue to have trouble logging in after doing this, please clear your browser's cache and try using an 'incognito' window.
If your issue continues after doing all of the above, please create a support ticket
from the email attached to the account in question and include a screenshot of your error. You can take a screenshot on your computer using the default windows 'Snipping Tool'. Simply click the start menu and type 'Snip'. You should then be able to locate the appropriate program. Once you have taken the screenshot, save the image to a location on your computer, then attach it to the support ticket.