To Edit your Organisation profile, first access your Admin Dashboard.
Next click on the Engage > Profile tile
This will take you to your Organisation Profile. You will see a 3 dots menu icon on the right under the banner image. Click the 3 dots to expand the menu and select Edit Organisation.
Edit you organisation details, and click next at the bottom of the page to get to the page where you can change your banner image or logo.
If you wish to delete you organisation profile click the "Archive" button