Or do you have to be member for that?

If you view your profile, there is a button at the top that says "edit your profile"

It's not even a button, just grey text in parentheses.

Sooooooooooooooooooorry

Settings > View your Profile > edit your profile

*view Public Profile*

or just click on your profile from the forum link or the link that comes up if you click on your name during a game.

Aah, great, thanks, I wonder why this hasn't been placed in the Settings section, same as for the missing Open tournaments tab.

Why does there need to be an open tournaments tab when there is a link for that very same place under tournaments? Can only have so many tabs before it becomes cluttered and unwieldy.

Why has there be an open games tab when there is a link for that very same place under my games?

It just doesn't fit, there's a tab for games you're in, one for games you aren't in, for tournaments you're in, but no tab for tournaments you aren't in!
Plus it saves one click. It can be annoying when switching from tournament A you're in to tournament B you aren't in if you try to follow the chat.

Or just have multiple tabs open with both chats running...

Okay, that was a bad example, but what about my other point? Is it in any way logic to have a tab for both open and joined games, but only for joined tournaments?

Yes, there is some logic. Open games tab will be hit far more often than open tournaments. The 4 tabs given are those that would be hit most often, and I'd wager its by a wide margin

Can't we call a vote or something?

Uservoice ftw

you only need to check open tournaments at most once a day, really. whereas the open games tab is constantly changing. theres no need to have immediate access to open tournaments. also, you get invited to more tournaments than the open tournaments you join, but for individual games its more likely that youll be joining an open game rather than being invited. so yep, theres logic, and its such a minor problem it isnt worth the trouble.