How to config SNMP on Linux device to connect OpManager

How to config SNMP on Linux device to connect OpManager

Hi,
I've build a Opmanager server on Windows 2012 and create SNMP credential.
I've also installed net-snmp & net-snmp-devel service on my Linux server. 
But I met the problem when add Linux device into this Opmanager. 
Have any body know how to config the snmp on my Linux agent with the SNMP credential which I creared on Opmanager?

Thanks

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