When creating SNMP sensors you must already enter some additional data on the Create New Sensor page:

First select between SNMP Traffic, Advanced, SNMP Helper or OIB Library (see previous section for details).
Then select the highest SNMP Version which is supported by the server or device.
For SNMP Version 1 and SNMP Version 2c please enter the SNMP Community String. In most cases this value is "public", check with the admin of the device you want to monitor if this value was changed for that device.
For SNMP Version 3 please also enter Authenication mode, username, password and encryption key.
The standard value for the SNMP Port is 161, but if you use other values please enter your value here, too.
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