I replaced a pressure switch while doing so it touched metal and now the furnace won't run I have power going I just here a clicking noise what can I do

It sounds like you blew the fuse on the circuit board. It should be on the bottom half of the furnace.

It looks like a car fuse the kind that you pull out and they are made of plastic. Usually yellow our orange. The power needs to be of when you do this. The only place you'll probably find it its in an heating and air conditioning supply store.