Board Thread:Support Requests - Getting Started/@comment-35874574-20180713172008/@comment-168424-20180713174742

Ask a Content Moderator or an Admin to do it. Regular users are generally prevented from deleting pages to guard against severe vandalism.

You can use Special:ListUsers/content-moderator or Special:ListUsers/sysop (Admin list) on a wiki to find out which users have these roles.