The search bar takes two things: what you want, and where. Either one on its own works — leave the location empty to search everywhere, or leave the service empty to browse a city.
Your location is remembered on your device between visits, so you only type it once.
On a professional's card you may see a rating, a review count, a booking band, and sometimes a badge. None of these can be bought. They are all calculated from real appointments and real reviews, and every one of them is hidden until there is enough of it to mean something — a rating needs at least five reviews before it shows at all. A studio showing no rating is usually a new studio, not a bad one.