Go to the Characters tab at the top and click "All Characters" on the dropdown. That should lead you
here.
There, you scroll all the way to the bottom (which is probably shorter for you than for me. There you can select a game system, give the character a name and then click Create. That leads you to a character sheet form that you can fill in. Once you saved the character, just head to any "Game Details" page for a game of that system than you're in and you'll be able to submit them to that game.
If you have any more questions, feel free to hit me up on the discord or by PM or create a new thread (
here maybe) and I'll be happy to help :) I don't want to derail DeJoker's recruitment here.