hello Sharon, best thing to do is to isolate the cold water supply and undo the joint and give it a good clean with a scouring type pad. i assume its a metal fitting,put a few wraps of plumbers p.t.f.e tape around the thread of the joint (B+Q) in a clockwise direction,a bit of tape aound the olive may also help.the olive is the ring which will be fixed a few mm from the end of the pipe and cannot be removed. the tape is thin and can be a pain to put on. you can then tighten it up,dont over tighten it or let it twist. hope you sort it.
xs 11
August 2010