You're not the first to come here in recent days with this question.
Near the bottom of the listing page you should see Preferences >> Settings, and clicking on the little pencil icon there on the right brings you to where you add your location. This found a desktop version.
I don't use the app or mobile browser, they're too limited, and I think when listing vehicles too, it's better to use a laptop / PC and try Chrome, that combo seems to work best. If using the app, that may be the issue here too?
@cider*red07