Where is the ad I posted yesterday?

It can take a few business days to be posted. Also check your messages by clicking your username and then messages from the drop down. Sometimes they require you to do extra steps to prove that you are in possession of the vehicle.

There's this as well: https://cargurus.helpscoutdocs.com/article/41-i-submitted-my- listing-but-i-can-t-find-my-car-when-i-search-for-it-what-happened