Before you change your band, place your Apple Watch face down over a clean surface like a lint-free, micro-fiber cloth or soft, padded mat.
Step1
Hold down the band release button, then slide the band across to remove it.
Step2
If the band doesn't slide out, press the band release button again and make sure that you hold it down.
Step3
Make sure the text on the band is facing you, then slide the new band in until you feel and hear a click.