In one sentence, describe what the following article is about:

It’s the blue and white paper airplane icon labeled “Telegram.” You’ll usually find it on the home screen.  It’s at the top-right corner of the group.  Now you’ll see a list of group members. This selects that user. If you are modifying a supergroup, you’ll have the option to set special permissions for this admin. Use the switches to enable or disable your desired permissions. It’s at the top-right corner of the screen. The admin is now added.

Summary:
Open Telegram. Tap the group you want to manage. Tap the group’s photo. Tap Edit. Tap Add Admins. Tap the person you want to make an admin. Tap Done.