I think that what you mean is that you tried to create a new Agent, as shown in the video, isn't it?
If that's the case, there are several reasons for it to be showing a Critical staus for its modules. First, you have check that the IP address of the computer/system that you want to monitor at the Agent setup.
Then, the modules have to be able to reach whatever they're trying to monitor (for instance, if you create a Check SSH module for an agent, the latter has to have installed a SSH server and have it running, for the former to be able to report information other than "critical").
If the agent is not reachable or the modules aren't pointing to a service/port/process (whatever) that is running, Pandora Server won't be able to get information and eventually will report "Critical".
As for the SNMP modules, again you need to have the SNMP service installed, properly configured and running. On a Windows machine, you need to enable it on Control panel/Turn Windows features on or off/Simple Network Management Protocol (SNMP). When it is installed, reboot. Then go to services.msc, configure SNMP service on Properties (communityname , allowed IP addresses, Community rights...) and run the service.
Now you should be able to create SNMP modules.
Hope it helps.
PS: When creating a new topic for a question or issue, please do it just once. I'm removing the other one on Advanced Monitoring to keep the Forums organized.