Samsung VERIZON Gear S3 CLASSIC Quick Reference Manual page 5

Step 2. Turn your Gear S3 on/off
To turn ON your Gear S3, press and
hold the Home/Power button.
To turn it OFF, press and hold the
Home/Power button, and then tap
Power off.
Step 3. Activate your Gear S3
Tap Activate on your Gear S3 and
follow the instructions.
Step 4. Download and connect
Download the Samsung Gear app
You can get it from the Google Play
Store (Android), the App Store (iPhone),
from Galaxy Apps, or visit:
Samsung.com/Gear.