Org Issues and Improvements

[Hamata]

I'd like the ability to choose if I want to use a custom avatar or a TW avatar

[Peasant Phill]

I'd like the ability to choose if I want to use a custom avatar or a TW avatar

You can. But if you chose one of you can't see the other.

[Hamata]

I' meant like upload a image to your fourm avatar like the one you see with your posts

[Secura]

I' meant like upload a image to your fourm avatar like the one you see with your posts

Settings > General Settings > Thread Display Options > tick 'Display profile picture in forum posts'

I believe that's what you're looking for, though your custom image will only be visible to those who have ticked the box themselves, otherwise they'll see your current TW avatar instead.