Lay the watch on a flat surface

Lay the watch flat and grab the included tool from the watch box.

Open the clasp

Use one hand to hold the bracelet in place, and with the other use the tool as a lever to open the clasp.

Slide the clasp to adjust size

Moving the clasp up the bracelet makes the bracelet smaller, down makes it larger.

Close the clasp

Press the clasp back down firmly onto the bracelet until you feel or hear it click into place.

Test the fit

The bracelet should feel secure but comfortable, with just enough room to slide one finger between the bracelet and your wrist.