What you need:
An Apple Watch face and Made By Chrissey's Apple Watch scrunchie band.
1. Remove your current band by pressing the band releasing button and sliding the connector up or down at the same time.
2. Hold the watch face with one hand and the band with the other hand. Face the watch face away from you. Hold the connector with your thumb and index fingers. The 2 black lines side face to you.
3. Slide the connector through the watch channel from the top down. Do the same with the other side.
The band used in the video is Snow White.