Design Studio setting permissions bw_service user

Hello,

we want to use some sdk extensions and configure the bw_service user.

We facing a problem in in chapter 5.5 - 1b)  of the nw admin guide.

The bw_service user exists in our system, but we can not assign this user to our bw system, because the user can not be found. Here is a screenshot.

The path in point 1b) is  System Administration >> System Configuration >> System Landscape

In our system "System Landscape" is only available over System Administration >> System Landscape

Is this the wrong configuration point where we are searching for it?

Thanks

Robert