Step 1: First, the two ends of the tail overlap, as shown in the following figure:

Step 2: Take a small piece of the same red rope and tie a knot in the middle of the overlap, as shown below:

Step 3: Pass the right end of the knotted red rope under the bracelet and put it over the left red rope, as shown in the following figure:

Step 4: Then tighten the red rope at the left and right sides at the same time, as shown in the following figure:

Step 5: Repeat the previous step 3 and step 4 for seven or eight times to complete the knot, as shown below:

Step 6, finally burn the remaining thread with a lighter, and you're done, as shown below: