Yo! So with the trainer card, there used to be a feature, where you could buy a new trainer card to swap out. Though I believe it got removed, I'm unsure. But basically it allowed you to change how your card looked when someone clicked on your name. I don't believe this feature works anymore even though it's there
Yeah sadly I think the change of forum version some time ago broke that feature. It is something we are looking to fixing in the future though.