Do you have Location Sensor on? And what is your default radius set at? Do you want people to already know the name of the city? You have city selector as a drop down so they would need to match Name, City and have it within the radius that you have limited them to.
Hope you are following the logic, add more radii options.
I just clicked on your site again and the search seems to be working, not sure what you changed, but it works now.