1. Head over to

https://business.facebook.com/adsmanager

and choose "Business Settings".

2. If you have more than one business, choose the business that owns the Ad Account you wish to connect with Datagran.

3. Enter “Ad Accounts".

4. Click on "Assign Partners"

5. Choose "Business ID".

6. Enter the Datagran business ID (265214357234151), choose the option "Manage Ad Account" and then click "Next".

7.  A confirmation will signal that the account is ready to be used.