After the host has accepted your bid and the campaign goes live, you can track the traffic and spend, view the campaign or preview your ad on the My Partnerships tab. Learn More Here.
In My Partnerships > Custom CTA > Current
How do I know how much I have spent on my Custom CTA Ad?
The Analytics tab provides the details on the number of clicks your Custom CTA Ad has produced.
Clicking on the View Campaign tab will allow you to view the campaign your Custom CTA ad is associated with.
If you want to see what you Custom CTA Ad will look like to entrants, click on the Preview Ad tab.