To connect Christmas tree lights, follow these steps: First, ensure that your Christmas tree is set up and ready to go. Next, locate the power outlet where the lights will be plugged in. If your lights have a power cord, plug it into the outlet. If they are wireless, make sure they are turned on and working properly. Once the lights are ready to go, begin wrapping them around the tree, starting at the base and working your way up. Ensure that each light is securely fastened to the tree and that no wires are tangled or overlapping.