To create a banner ad campaign, simply:
Upload your creative
Set where it will appear and in what size
Select your product and set your budget, duration, and any other page-specific details. Then press launch!
Depending on the marketplace's settings, your ad may be subject to the marketplace's approval before it is actively competing in ad auctions. If so, wait for the marketplace to approve your creative on their Topsort dashboard.
In the case that they reject your submission, you may receive an email with feedback about your creative or campaign details that they found issues with. You can choose to correct those issues and resubmit it as many times as you want. Once it is approved, your ad will compete in auctions and win customer impressions once it is displayed on site.