Plugin API info

Plugin API info

Sorry if this has been answered already.  I just couldn't find it.  I am using a web file manager and it has a plugin.  I created an API but it may not be a remote api since its asking for more info .  FYI, it ask for the API key, which I inputed but it also asking for the secret key which I do not see where one is at.  Also there is an option for Z-agent.  What is that?

Here is an screenshot:    http://screencast.com/t/TLTceo0QY38T

Thanks