@Amy421
If you have the link to look up the apartment, that is how you find the property directly. If the link is broken, it is likely that this property has been delisted or discontinued.
Using the site, the property must be available for your dates in order to find it. For some properties to show, you would need a fully verified profile, complete with government ID.
If you post the link on the forum we can also try and see what happens, but my hunch is that you need to complete your profile to be able to see all properties.