Ahhh, think I figured it out, it should be:

 

public voidAddUserToContactList(stringuserLogginID) //Add parameter user logged in user's contact list

{

ChatSystem.Instance.GetCurrentPortal().DataManager.AddContact(GetLoggedInUserIdentity(), "User:" + userLogginID);

}

 

This seems to add the user approprately.  Still integrating the other answers and they work great.  Thanks for your help!