Go to : business.facebook.com/settings
Log in using your personal Facebook account.
If you have access to multiple businesses, make sure to select the correct one from the drop-down menu in the top-left corner.
Navigate to Business Settings to access your account configuration and preferences.
Select Ursa OR If you have not added Ursa yet:
Click the blue Add button.
Select Give a partner access to your assets.
A window will appear. Enter Ursa's Business Manager ID: 271733749993723.
Click Next.
Once Ursa Marketing is selected, click Share Assets. If you have just added Ursa, proceed directly to the asset-sharing window.
In the window that appears:
In the left-hand column, click Ad Accounts.
In the middle column, select the ad account(s) you would like to share.
In the right-hand column, enable the desired permissions by selecting Full Control.
Click Save Changes.