Disney Student Watch for Men, Simple Waterproof Dual Calendar Quartz Watch, Exam Watch for Middle And High School Students, Back to School MK-12053B3

1. Pry open the bottom cover with a hard object

2. Move the buckle to the appropriate slot

3. Press down the bottom cover; the grooves on the other side of the strap are the slots

4. Align the hook with the buckle on the other end

5. Hook the buckle onto the slot

6. Close the cover to complete the process.