Problem with my name displaying during a game

Hi, I just created my account and after a misunderstanding I wanted to change the name which is displaying during a game. Unfortunately it still appears as the first name I entered, any idea?

You can change your display name within the app through the My Settings tab on the Sidebar. Roll20 Wiki said: By default, the Display Name is set to whatever is currently listed as your Roll20 account username. This name displays in a name plate positioned below your avatar portrait on the very bottom of the Tabletop. You can change this to suit your individual gaming needs like a specific character name or a game role. Click on the Save Name button to save any changes made in the Display Name textbox.

Wow thanks for the quick answer, I actually haven't seen this option earlier! Thanks a lot!