You have created your Image Display Campaign, so the next step is to set up the content.
Go to the Campaigns overview and select the Campaign you have created from the section "My Campaigns".
At the new window, click on the Content Button.
Then, the next step is to Upload the Visual and insert the target URL (for instance if the visual is about the upcoming sales, then the URL should direct the customer to your Offers section of your website)
When you complete editing, you can press the Preview to test how the campaign would be displayed to your customer!