First of all it sounds like you need to take the Splunk tutorial (http://docs.splunk.com/Documentation/Splunk/latest/SearchTutorial/WelcometotheSearchTutorial ). It equips you with the knowledge you need for knowing where to look for solutions. Secondly, the join command docs are here: http://docs.splunk.com/Documentation/Splunk/latest/SearchReference/Join
I have only loaded 2 data source.I dont know how to join this.
Give me some tutorial links or description to join this.
Where exactly are you running into problems? I guess you found the "join" command but ran into some kind of issues with it?