To change your search location, tap the location icon. Type in your new location, and then tap "Swipe in (selected location)" to save.
You can also just tap the arrow icon in the top right-hand corner of the screen to swipe in your current location.
To update your search distance, navigate to "Filters" via the menu and adjust the distance slider. Your distance setting should update immediately.
If you wish to change your own location, please update your current city via your Facebook account. Once this has been done, go back to your JSwipe profile, tap the "Edit" pencil icon and tap "Update Facebook interests".