MarketPress account - changing access credentials or adding one

I am logged into MPMUVDEV as Frank.

EDIT: Please don't leave any login details in threads

But I am actually the independent developer he has contracted to customize the site. Using this system would be a lot easier were I allowed to log in directly under my own user/pw - or if the is not possible - change the credentials so I am the account holder.

I am confident that Frank will approve this because I am also hosting the site and will continue to maintain the site after it is published.

Please advise me how this might be done.

Joe Harkins