Most pages have a
button in the upper right-hand corner -- that link provides help
for the page you're on. For example, the
button on the Open Invites page tells you what Open Invites are, how to accept an
open invite, how to post your own, etc.
Tournaments, accounts, all of the games, etc., each has its own page of useful info.
More than 80% of the questions we're asked are answered in the help,
so you could get your answer right away!
But of course we're happy to help if you can't find what you're looking for.