If you don't know where a member lives you can open the menu on the map (top left corner) and search for a member by name in the alphabetical listing of all members. Clicking on their name will reveal where they are on the map and open their profile.
If you are looking for a member on the map but can only find a different member that lives at that same address that is because their map profile is hidden behind this other profile. To open the member's profile that you are looking for you need to look them up in the alphabetical listing
and click on their name. This will reveal their profile and show their pin on the map.