As an admin to create a pinned post:
- Tap your profile icon in the bottom menu.
- Tap the switch icon at the top of your profile.
- Tap the community name under Switch To Admin Account. (This will switch you to post as the community)
- Tap the '+' icon in the top right corner.
- Create your post with a title and body.
- Tap the Pin icon.
- Tap Post when ready.
- Note: You must have admin permissions to use this feature