Yes, you can change the strap of your Apple Watch and it is very easy! Push the strap release button at the back of your watch, and the strap will slide out. If the strap doesn't slide out, press the strap release button again and make sure that you hold it down. Ensure the strap is attached to the correct side. Look at the adapter, and make sure the side with the metal middle piece is facing the under-side of your watch. You should hear a light click when you put the strap correctly.