I have recently installed the SAP ABAP 7.51 trial system to try to configure the content repository.
However when I am accessing the newly installed system using SAP GUI using SAP* (or DEVELOPER) user account

and open CSADMIN or OAC0 transactions the Create/Change buttons are disabled on the toolbar and I also cannot edit any of the existing content repositories.
Am I missing any permissions? How can I check for those?
PS: I'm not trying to set up SAP content server, we're going to use third-party one.
Okay, I seem to be stupid - in order to be able to edit content repos I first needed to click Display/Change button (Ctrl+F4). Then the Create option became available.