Open the poster image window
In WordPress, open WooCommerce → seeonwall.com, then the Products tab. Find the product and click its thumbnail. Click Use an image URL instead.

The poster image window. Use an image URL instead is next to Pin the product image. Enter the URL
Paste the address of the image file into Image URL and click Use this URL.
The address must start with https:// and open the image file itself, not a web page that shows it.

An image address in the Image URL field, ready for Use this URL. Mark the artwork
When the image is a mockup, click Mark the artwork under Artwork area and drag the box around the print, as for any other poster image.
The plugin can suggest a box only when the other server lets the browser read the image (CORS). If it cannot, drag the box yourself.
Check the allowed domains
When your shop has a list of allowed domains, the domain of the image must be on it. If it is not, shoppers still see the poster on their wall, but the preview image to download or share is not made. To see the list, click Open dashboard on the Settings tab, then open Shop settings → Allowed domains.
Save and check
Click Save. Then move the pointer over the row of the product and click Preview on a wall.
Need help?
Tell us which product and which step, and we will help. Email support@seeonwall.com.