Site administrators can promote any normal user account to a site administrator via either the user admin dashboard or a command-line utility.
Search for a user account from the Command Bar (or go directly to its URL).
In the upper-right corner of the user's profile page, click .
On the left side of the page, click Admin.
In Danger Zone, under Site admin, click Promote.
Type a reason for promoting the user account to a site administrator.
Click the promote button.