Set up an SNMP server in registered servers. Use the correct IP address and SNMP format and communitiy details, you may need to talk to the QRadar guy to get them. Having the correct QRadar receptor on the QRadar end is difficult, our vendor took three tries to get the correct one from IBM.
You may wish to configured a separate purge task for the QRadar SNMP messages. The way our vendor set it up, it sends boatloads of SNMP messages to the QRadar server. I had to purge every 10 days. Also, you'll want a exclusion view task for the QRadar SNMP messages. The server task log becomes almost unusable due to the recording of all the SNMP messages sent.