I remember this being unnecessarily more difficult than other OPSEC integrations I had performed.
Here is a screenshot that may help you get started. The trick was obtaining the correct DN's for the QRadar OPSEC object and the SMS.
The OPSEC DN is easy enough to obtain. Just edit the properties of the object and copy+paste the DN next to the Communication button.
The SMS was a little trickier unless someone knows I shortcut I don't. In R77, I think you used to be able to just see this by viewing the properties of the SMS and clicking the Communication button. This seems to be a bit different in R80. The quickest way I was able to find was to enable the ICA Portal. From the CLI of your SMS, run:
cpca_client set_mgmt_tool on
Then browse to http://<ip of your SMS>:18265
You should be able to find the DN of the SMS there. Once you have it, turn the ICA Portal back off: cpca_client set_mgmt_tool off
For some reason, I had to manually copy the certificate from my SMS to the QRadar server. I think this was because the two servers were on different LANs without the proper Firewall rules to allow the ICA communication. Assuming you have that, you should be able to skip the part about specifying a file name for the cert.
Since the procedure is different from here, I found these steps in a different Check Mates thread on this topic. Hopefully, this should be accurate enough to finish the configuration!
Specify Certificate Checked
Certificate Authority IP IP of your management server
Pull Certificate Password the shared / trusted SIC secret you specified in OBSEC object
Enabled Checked
Target Collector which QRADAR appliance do you want to reach out to the Log Server
Coalescing Events Checked
Store Event Payload Checked
Log Source Extension I left this blank
Select QRadar Groups Check the group you want.
R80 CCSA / CCSE