Steps to Reproduce:

1. Try change the "User:AnYiLin/userpage.css" with https://zh.wikipedia.org/wiki/Special:ChangeContentModel.

Actual Results:

1. For non-administrator or an interface administrator, the Special:ChangeContentModel page says that an administrator is required to execute it.
2. For an administrator only, the Special:ChangeContentModel page says that an interface administrator is required to execute it.
3. For users with both administrator and interface administrator, the operation is feasible.
4. This may be because the operation requires permissions like "editusercss" and "editcontentmodel", and this requires two user groups on zhwiki.

Expected Results:
Provide more precise user group combinations or permissions error details.