Super Mario Boards

I can't figure out how to change my name, so I'm am going to be have not amused yoshi as my pfp.

To change your username, just click on the button that's next to the envelope. Once you click it, a menu will appear. In the menu, click on the option change username. Then type in the username you would like to have and once you're finished, click the button below to submit it. If the name was already taken, you can make some slight adjustments before submitting it again. I hope this helps!

The change username button isn't there.

Can you provide a screenshot for this? I usually see it when I pull the menu down on my end.