Cannot change the Collaborate Option

[Ania]

Hi All,

Does anybody know how to change _ Collaborate Options to
connect to the server? I have set the connection option to
my _ project server account_ but now i want to connect to
the server ( from Project Pro) using my _windows accont_
but in the Collaborate window the option for the account
name is grayed out with my Project server account. I guess
I set it as default which saves it to the Enterprise
Global. I tried to change the Enterprise Global but I
couldn't. Is there anyway to change that?
Thanks a lot,
Ania