Open Instagram and create a new post, Reel, or Story
Edit your content as needed
Tap Tag people
Select Invite collaborator
Search for and choose the account you want to collaborate with
Finish creating the post and tap Share
Wait for the other account to accept the collaboration invite
Once accepted, the post will appear on both profiles
For Stories, use the mention or tag sticker instead of a collab invite
Make sure both accounts meet Instagram’s collaboration feature requirements
If the option is unavailable, update the app and check account settings