Flip your Apple Watch over.
Locate the band release buttons on the back of the watch.
Press and hold a band release button.
Slide the band out of the watch.
Repeat for the other side if removing the full band.
Align the new band’s connectors with the grooves on the watch.
Slide the band in until it clicks.
Press the band release buttons and adjust the fit if needed.
Release the buttons and confirm the band is securely attached on both sides.