Here is a few screen dumps for Armored³ that describes the propagation editor.
The tab areas are live, so you can navigate through the different screens by clicking on the tabs.

In this third tab you will have the opportunity to specify one or more destinations for your propagation. A destination specifies an essbase server that you wish to propagate the information to. All you will need to to is select the desination server(s) and provide an administrator login information for your selections.