Well, connecting the lights to a pre-lit Christmas tree is quite simple. You will need to find the plug that connects the lights to the tree and then simply plug it into a power outlet. Once you have done this, you will need to connect the other end of the cord to the top of the tree. You may also need to adjust the light strands to ensure they are evenly distributed around the tree. Then, simply turn on the lights and enjoy the beauty of your pre-lit Christmas tree!