Have you listed your unit yet? If not, check out How to List a Unit
If yes, then here's how to check if a listing:
Go to your RentRedi dashboard
Click the "Properties" tab
Select the unit you would like to check
On the "Unit Details" page, you can click the box for each listing partner (Zillow, Trulia, Hotpads) to get an update of if the unit is listed or not.
If the unit is live on the partner site, the box will be blue and you'll be able to navigate to the listing
If the unit is live on the partner site, the box will be gray and you can click it for the reason why