Thread:Project:Support desk/Do NOT Succeed to entre as ADMIN/reply (11)

What kind of "admin menu" are looking for? By default, the only menu that points to Special:ListUsers is Special:SpecialPages. You can get to that page from the menu on the left, and the link to the user list is in the "Users and rights" section.

The Admin Links extension provides an easily accessible "admin links" page, and one of those links is the user list. Is that what you're looking for?