first of all in the dmu public server It doesn't show my latest name when I type it says HeyItsMarty but my latest name is MrLinkhasaTARDIS

secondly in the site I cant enter my user name (MrLinkhasaTARDIS) it says The Username is taken 

HELP ME

I've got the opposite problem .

I have typen wrong username.

And support email is dead

The support email is not dead. John (1WTC) is currently busy with real like stuff so it can take a while to get a respond.