How To Replace or Remove Your Apple Watch Bands

1. Lay your apple watch face down.

2. Locate the small buttons close to the top and bottom of the Apple Watch back.

3. Push and hold the button and slide the band out to either side to remove it.

3. Repeat to remove the other side of the Apple Watch band.

You can visit the help article on Apple's website also. 

How to change your Apple Watch band.

While you're here be sure to have a look at the newest Apple Watch Bands.