Do you know where you're main shut off valve is? if so you shut off water to the house (and that pipe) you then take a wrench and unbolt the tap assembly from the valve (the nut sitting directly behind the silver information plate on the front) you then take it down to the best plumbing supply place in town, if that's home depot you're probably hooped, and ask them it they have either a replacement tap assembly or a whole valve you can cannibalise, if they do you take that home, wrap the threads in teflon/ptfe tape and reassemble, its not a tough job, just be careful not to wrench on it to hard and when you turn the water back on have a spotter to tell you its leaking if you havent taped it or wrenched it down enough
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