The CSA is a one way connection only. You can't actually push tasks to a device via the CSA. You will want to setup your tasks as Policies, and then once the device runs policysync according to it's schedule it should pull down and execute the policy task.
You can manually trigger a policysync, policysync.exe is located on the clients in the ldclient folder. For agent settings updates, make your changes to the agent settings and then when vulscan runs on the endpoint it will pull down the updated settings. If you want to actually change which agent setting applies to the device as opposed to just updating the existing setting, you'll need to use a task.