Hello Slim Shady. I am so honored you want me as a bureaucrat on your wiki. I will give you a step by step tutorial on how to promote someone on any wiki. Please not that this is how it will look on a computer. I have no idea how it will look on an iPad.
Step One: Look at the banner on the bottom of the screen. There should be there should be the word "Admin" on the bar. Click on it.
Step Two: Clicking on it will bring you to Special:AdminDashboard. Scroll until you reach the "Community" section, and click on "User Rights".
Step Three: The next page should be Special:Userrights. Type on the name of the user you want to promote into the box. Warrning! You need to type in the name exactly as it appears on their user page. Type capitols where they should be, and use a underscore (_) in place of a space.
Step Four: After you've typed the name of the desired user into the box, now you can check or uncheck the user groups on the list. The examples are from my sandbox wiki, so I am already an admin and bureaucrat.