In Business Settings, within the Users > People section, click the “+ Add” button to Give Access to Your Facebook Business Manager. See the below screenshot for reference. This will bring up a pop-up form where you can add people by email.
2. Go to Business Settings
3. Click People under Users
4. Click Invite people
5. Enter the email address of the person you want to invite
6. Click Next
7. Select the type of access you want to assign
8. Select the asset you want to assign and choose the type of access
9. If assigning partial access, select the task-based permission they need to do their job
10. Click Invite
11. Review the invitation and click Send request