front blinkers

flashers work in the back, but not in the front.

That's part of what I asked, did you do any other testing or visual inspection?

I went to auto parts store and bought the bulbs that belong to my vehicle, and I am not a mechanic so I do not know how to TEST for voltage and ground at the socket.

Well, other than guesses at this point , I'm not sure what else to suggest. If you are sure they gave you the correct bulbs , and they are installed correctly, testing wires/switch/relay/flasher/fuses. Sorry! Proper hands-on diagnosis would likely be most effective way to solve the problem.