To connect your Marpipe account to your Facebook account, go to Ad Account Settings and simply click the "Connect" button.
Complete the prompts in the Facebook pop-up. When you're done, the button will change from "Connect" to "Disconnect". You can disconnect by clicking "Disconnect".
Once Facebook is connected, you will be prompted to select an ad account, Facebook page, and Instagram page to link to your Ad Account.
You also can select the option menu in each ad account and select "Edit Account" to edit its Facebook page, and Instagram page.