Samsung Galaxy S6 User Manual page 251

4. Tap a Wi-Fi network, enter the password, and tap CONNECT.
 Your phone is connected to the selected Wi-Fi network.

The password, for a household wireless LAN router, is sometimes found on a sticker on the
router (WEP, WPA, KEY, etc.). Contact the router manufacturer for information. For
password for a public wireless LAN, check with user's service provider.

Entering a password is not required if an access point is not security protected.
Settings 242