Adding hosts to splunk

I have installed universal forwarders on all of the servers I want to monitor with Splunk. If I go on the Splunk Server to "Settings" -> "Add Data" -> "Forward" I find all but one of the servers in that list. Lets call the server serverx If I go from the Splunk dashboard to "Search and Reporting" and search for that server that is missing in the forwarders list I find information on it. host=serverx Is there some way that I can get serverx into the list of forwareders so I can define monitoring parameters for the hosts? Or is there another way of doing this all together?