To filter the profiles you see, ensure your muzmatch app has Location permissions - to do this tap the Filters and Prefererences button (top left) - or go to
Menu → Filters & Preferences - and grant Location Permissions.
Once done go to DISCOVER and view new profiles - your location should now update using your GPS and use any filters set.
Discover only shows those who match all your Filters. Explore only Filters by Age and Location
The more you filter the less profiles you will see.