To put tinsel on a Christmas tree, start by selecting the type of tinsel you want to use. Tinsel comes in a variety of colors and styles, so choose one that complements the other decorations on the tree. Once you have your tinsel, begin by placing it at the top of the tree and working your way down. Gently wrap the tinsel around the branches, making sure to overlap the strands for a full and even look. As you wrap, keep an eye on the spacing and symmetry of the tinsel to create a balanced and beautiful effect.