1. Go to Marketing > Integrations and click a card's action button (usually Edit integration; a few cards show a different label such as Manually Configure). Clicking the body of the card itself does not open the window on this page.
2. A window opens showing the card's description, its status badge and a Configuration section with one row per setting.
3. Click the value you want to change. Text fields open an inline editor; drop-downs show a list; multi-select fields show check boxes; colour fields accept a colour code.
4. Press Enter or click the check mark to save, or Escape / the cross to cancel. Each field is saved on its own the moment you confirm it - there is no separate Save button.
5. Where a setting has a Get Key / How to Get Key / Meta Developer Portal button next to it, that button opens the third-party page where you obtain the value.
6. Click Close when finished. The status badge on the card refreshes automatically after each save.

Some cards add extra sections below the Configuration rows (for example Email Verification, Catalog, Connection Status, Setup your Domain) with their own buttons.