When you add an offer to your review site a screenshot will be automatically generated. If you want your own image or picture instead, go to "edit offer" and select the offer you want to edit. Next to the screenshot you see a list of buttons. When you click on Screenshot, a dropdown menu will open. Here you can upload your own image. If you want to generate a new screenshot (because for example, the website of the offer has changed), you can also select this in the dropdown. It may take a few minutes for everything on your site has been updated. So no worries, if you don't see the new image immidiately.