How do I add someone as an admin to my group in Messenger?

If you're an admin of a group in Messenger, you can add other admins. To add someone as an admin of your group in Messenger:
Desktop App:
  1. Open the group conversation.
  2. Click the name of the group conversation at the top.
  3. Click next to the person you'd like to add.
  4. Click Make Admin then click Make Admin.
Desktop (messenger.com):
  1. Open the group conversation.
  2. Click to the top right to open the conversation information.
  3. Below Chat Members, click next to the person you'd like to add.
  4. Click Make Admin then click Make Admin.