Open Instagram and go to the post, Reel, or Story you want to collaborate on
Tap Tag people or Invite collaborator
Search for the account you want to collaborate with
Select the account and send the invite
Wait for the other account to accept the collaboration invite
Publish the content after the invite is accepted
Check that the post appears on both profiles
Use the same process when creating a new post or Reel by adding a collaborator before publishing
Make sure both accounts have public profiles or allow collaboration settings
If the invite is not accepted, resend it or ask the other account to check their notifications