Business Manager is a Facebook tool that helps you organize and manage your business. When you join Business Manager, coworkers can't view your personal Facebook profile unless you approve their friend requests. Coworkers can only see your name, work email address, and the Pages and ad accounts you have access to.
You need a Facebook profile to create a Business Manager account. You use your Facebook username and password to sign into Business Manager. It's a more secure way to log in than with just an email address and password.
Note: You can create only 2 Business Manager accounts. If you need more, please work with someone else in your organization to create additional Business Manager accounts.
Before you begin
Make sure that you have a personal Facebook account to confirm your identity.
Create a Business Manager
To create a Business Manager:
Click Create Account.
Enter a name for your business, your name and work email address and click Next.
Enter your business details and click Submit.
Now that you have set up your Facebook Business Manager account, you're ready for the next step: Connect your Instagram account to your Business Manager.
This article is courtesy of MetaBusiness