In order to use WLC Manager you need to first run a discovery from the Discovery console to discover and model the Wireless Lan Controller (WLC).
When doing this you can set the option to also discover and model the Access Points (AP) that are associated to the WLCs from the Discovery console > modelling options > select Create Wireless Access Points.
If you do not discover the APs at the time of modelling the WLCs youll need to do this after from the explorer tab in OneClick > WLC Manager > from the contents pane select the information tab > configuration sub view > select run button for Access Point Discovery.