Discover is the part of the app where you see other Hinge members. To adjust who you see on Hinge, you can edit your Preferences.
To edit your preferences:
Tap the Settings icon on the lower right corner of your navigation bar
Tap the preference that you want to change
Turn on Dealbreaker if this is a strict preference. These changes will immediately take effect in Discover, otherwise you may see some potentials outside of your filters.