I you want to add more profiles to your analysis you should select add new profile and then click on add. Then you choose a profile you wish to add, select the time period, and click on add. When you have done this, you click on update to finish, and now the analysis tool should include the selected profiles.
This function can be useful if you want to e.g. compare to topics, competitors, spokespersons or something else. If you have Pulse, you can also compare profiles in Pulse with profiles in Monitor.