Step 1: Materials
-A string of lights with a blown fuse.
-Two replacement fuses that match your voltage requirements.
-A thin tool to pry the blown fuses out of the plug.
Step 2: Removing The Blown Fuses
Step 3: New Fuses
Step 4: Done!
If they do not work, a bulb may be damaged, or broken, or the wire may have been damaged. These are both easy fixes that should be covered in the instructions for the lights. The fuse replacement, however, is not (at least on any of my lights).