1. As a Platform Manager, upload the image to Core > Settings > Logos and Seals.
  2. Then go to onMessage > Website > select the website > Master Layouts.
  3. Click on the master layout to edit the master layout.
  4. Drag and drop the Logo widget to the Banner/Header region.
  5. From the drop down, select the image you uploaded to Logos and Seals.
  6. Click the gear to edit the settings.
  7. In the URL field, enter /Page to link to the home page.
  8. Click Save.