First make sure you're in host view @Mary7544
In the app or desktop, go to menu and look for "switch to hosting" in the list or near the menu.
Once in the host dashboard you'll have a "Listings" tab.
If you can't switch to hosting, go to the Help Center. Support will be able to help you find the listings if they're still there. One possibility is that you may have created them under a different profile.