You can update your filter settings by tapping the filter icon in the top left corner of the screen. From there, you can adjust who you want to meet, age range, distance, and location, along with more advanced filters.
After adjusting your filter settings, once you tap "Apply Filters", your Zapping stack will refresh with updated results. You can also adjust your filters through the Nearby users list under the Communities tab.
Keep in mind that extended filters and location changes require a Plus or higher membership.