1. From GUI go to > Preferences > Management Settings (see screen shot below):
2. Use SNMPv3 (under version should show v3)
3. user is admin and default password is admin123, which you can change.
4. Use MD5 auth and DES encryption and these cannot be modified.
5. Enable traps generation (turn to ON - blue)
6. Input the SNMP Trap server IP and modify version to v3. Leave port at 162
7. Select Save