To find the correct fuse, you must consult your owner's manual. It will have a fuse diagram showing the amperage rating and location of each fuse, including those related to the wipers.
Failing that, look for fuse boxes located typically under the hood and sometimes inside the cabin (often near the steering column or under the dash). Each fuse box will have a diagram on the inside of the lid indicating what each fuse controls. Check carefully as fuses may look similar, but have different amperages. Never replace a fuse with one of a higher amperage.
If you're still having trouble, a qualified mechanic can quickly diagnose the problem.