Once you're logged in, click on gear icon and Navigate to Business Settings in the drop down.
3
Navigate to "Instagram Accounts" under the "Accounts" section.
4
Select "Add Instagram Account."
5
Tick the checkbox to agree to the Terms, then click 'Claim Instagram Account."
6
Enter your Instagram username and password, then click "Next." Follow the on-screen instructions to complete the process.
Remember, managing your Instagram accounts through Facebook Business Manager allows for better control and collaboration, especially if you have multiple accounts or work with a team.