How to add Resonate to your Facebook Ads account?

Go to Business Manager -> Business Settings -> Ad Accounts
 
If you don't have an ad account yet - create a new one by clicking + Add button (you can find it at the top of the second column)
 
To grant access rights to Resonate - choose your ad account -> Partners -> Assign partner
 
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Click Connect your ad account using your partner's Business ID instead: