There are 2 steps in creating a Pop Up Window. First you will need to upload the image to the console, second to create the Pop Up Window.
1. Upload the image to appear as a pop up:
Utilities > Documents > Listing > Actions >
Image must be the following dimensions:
420px width x 265px height
Once uploaded, copy the image asset URL highlighted in yellow, from /assets onward:
2. Set Pop Up Window Tab:
Shop > Shop Settings > Design > Pop Up Window > Actions > Add
1. Enabled = Yes
2. Centre the window
3. Select image icon to populate image window
4. Paste image asset URL: /assets/uploads/2006/documents/IMG-Pop-Up.jpg
5. Select location of the pop up window to appear
The image will display every seven days per browser, unless the user clears their browsing history including cookies.