Dynamic prop problem

Hi,

I'm trying to get big animated fan blades to my map. In editor I choose create entity -> prop_dynamic and then I click somewhere on the map, but nothing seems to happen, there was nothing I could click or edit. I even tried clicking prop_dynamic entity over prop_static without luck. So I gave up on that and copy pasted animated fan blades from an official map. Now I got animated fan blades which are too small for my purposes. I tried scaling them bigger which seemed to work in the editor, but when I went to test it in game, it didn't: fan blades were still small and scaling did nothing. I would like to know how to add dynamic props and scale them, thanks!