Sure, here are the steps to change a fuse on LED Christmas lights: 1. Unplug the lights from the wall outlet. 2. Find the fuse box on the plug and open it. 3. Locate the blown fuse and remove it. 4. Insert a new fuse into the slot and close the fuse box. 5. Plug the lights back into the wall outlet and check to see if they are working properly. 6. If the lights still don't work, check for loose or damaged wires or bulbs. 7. If everything is intact, contact an electrician for further assistance.