Guild Wars 2

Is funny, the suport that they give me is send me 4 times an email like this…

Your recent incident update was from an email address not associated
with the incident. In an effort to maintain the security of
information, we cannot update the incident using this email address.
If you are the incident owner and your email address has changed, or
you want to be able to update the incident using this email account,
please update your contact information using the following link, then
resubmit your update.

Evening

When I was signing up to GW2 I didn’t knew what was the Display name, so I unfortunatly used my real name.
In games I don’t like to use my name and is a bit uncomfortable. I would like to know if i can change it.
Also, and I don’t know if this is possible at all, i need to change my email (account name), because i think someone is hacking it.

Thank you