Change Display Name

Hi there - 

This AM I was in a meeting and needed to quickly look up something in Experience League. I did get a popup about changing my display name and obviously couldn't get to it right then. I've now come back and this name seems permanent - I've already spent too much time trying to figure out the change - I don't see any option in Account Settings. Can someone please outline what I'm missing so I can get this "HE" out of my name here? 

Thank you!