Add the External Event request URL to the "Approve" and "Reject" buttons.
To do this, go to Botmama Settings and scroll to the "Events" section. Copy the link from the External Event named "Request Approved". Return to the Bot Editor on the "Sending News" screen. Find the Buttons on this screen, open the settings for the "Approve" button, and paste the External Event link into the "Request URL" field.
Do the same for the second button. Go back to Settings, copy the link from the External Event "Request Rejected", and paste it into the "Request URL" field of the "Reject" button.