Can someone explain how to change your screen name ?

Contact TER Admin.

Talk to Admin- better yet piss them off --come back as TS Swishy !

ROTFLMFAO !  It's a JOKE !  Swish does sound a bit gay however.

Seriously, hit the contact us icon at the top of the page and let admin know you want to change your username. Be specific.

Tell them you wish to change your handle name.  Assuming the new name is not already taken, you should hear back positively within a day or two...