This can be done by adding an image to an item in a Links category. Follow these steps to set this up:
  1. Start from the onMessage persona
  2. From the Content drop down, select Links
  3. Create a new category using the + Add Category button and click Save & Add Link when set up, or click the green button next to an already existing category
  4. Enter a title in the Title field, then select a link type and enter a link destination
  5. Click the + Add Photo button next to Photo and select the image you want to be the image link from your computer in the file explorer that appears
  6. A hover photo can also be added by clicking the + Add Photo button next to Hover Photo, which will change the link image to this selected image when a user hovers their mouse pointer over it
  7. Click the Save button