Nagivate to Discover > Monitored and then locate the node you want to tag. When viewing the correct node scan for a particular node, locate the tag icon in the upper right corner.
Click the tag icon to display the edit tag field, enter a tag and then press Enter to set the tag.
Once tagged, the label will be visible next to its time stamp in the Scans dropdown on the left:
Navigate to Control > Policies and locate the policy you would like to tag. Find the tag icon and click it to begin editing the policy’s tag. Press Enter to save the tag.