I can't find my ad.

First you must ensure that you have completed the 3 steps to place your ad.
1- Create a Building
2- Create a Unit
3- Create an Ad.
If these three steps are done and saved, check that you have indeed publish the ad. On the Management page if your ad is in the Ads to publish you must click Publish these listings to go to the payment and post your ad.
If all these steps are complete you can go see your ad by clicking on the management page and click on Ads and My ads. You will see a list of your active listings at the bottom of the page and you can click on the icon in eye shape to see the ad.