First User has no Admin Rights

Hello everyone first i want to say that i am fairly new to the World of CRM´s so please be patient.

Two days ago i installed the VTE 4.5 on a fresh Windows Server.

So i logged me in with my account to Activate the Server it loads and then asks me to create a Mail Server, but as i tried to do so i encountered the problem that my user (the only user) had no admin rights.


My Question now is: How do i get my Account the Admin Access.
I think that i have to change a log file but i would like to know which one and what i would have to change in it.