Here are the steps:
1. Set the SNMP as enabled.
2. Go to the “SNMPv3 Community Configuration” page, and click the “Add New Entry” button to add your community name.
3. Go to the “SNMPv3 Users” page, and click the “Add New Entry” button to add new user.
4. Go to the “SNMPv3 Groups” page, and click the “Add New Entry” button to add the Group of v3.
5. Go to the “SNMPv3 Accesses” page, and click the “Add New Entry” button to set the security level for the new group of v3.
6. Save the configuration.