The question is SuperUser material, but not because it does not mention the word "server."
The fact that it doesn't mention if his instance of Lion is the server version doesn't discount it immediately. In my experience with Apple Servers, it's not uncommon for Apple SysAdmins to refer to the OS as it's base name and leave off the "server" designation.
The fact that the question is at such a basic level, however, does relegate it to SuperUser.
Server Fault is for system administrators and desktop support professionals, people who manage or maintain computers in a professional capacity.
The question, rephrased, says "I cannot perform a basic operation with a basic component of a computer operating system." That is not the earmark of a professional systems administrator. However, I'm not about to make this a discussion about the OP's professional status. Even if he is a professional systems administrator, the fundamental nature of the question does not in any way distinguish it as being for the crowd of people that ServerFault is targeted at.
##Summary
Not distinctly SysAdmin related. Needs to be on SuperUser.
I believe this is a finer case that might be harder to distinguish for someone outside of the SysAdmin / ServerFault realm. Thanks for asking, though!