Initially you have to sign each of them up separately, but for each account that you sign up to Linktree PRO, you can add other users to manage it. If you want to have more than one account on our pro subscription, you will need to sign up each account individually to a separate pro account and pay the additional fee.
Let's imagine a situation where you have two accounts:
If you want to be able to manage both accounts from the @myotherinsta account, you need to sign @myinstagram up to Linktree PRO. Once that's done, go to the 'My Account' section of the Linktree Admin, and you'll see the area where you manage user access:
Click on '+ Add an admin' and then enter the Instagram handle of the account that you want to grant access to (in this example, @myotherinsta):
Then click 'Add'.
You'll see both users now have access to manage this tree:
Now, the @myotherinsta account will be able to manage both accounts. You're still signed in as @myinstagram though, so in the menu in the bottom left corner, click "Sign in as a different user". This will sign you out of both Linktree and Instagram so that you can sign back in with @myotherinsta:
When you log back in, you'll see that you can now easily switch between both accounts in the menu in the bottom left!