i have made an alliance and a member has been conquered, how do i fight and remove conquerers to defend my ally?

well, to free him you can ether
1. have the conquer release him
2. conquer the guy who conquered him (click the yellow flag to see who it was)
3. have the guy in your alliance rebel and help defend him

sorry for sounding like a noob, but how do i do the last option as when i send soldiers in nothing happens and my ally is still conquered

everyone have been new
(if you want a mentor to help teach you click the picture in my signature and fill out the form )

but he need to start a rebellion, to do that he just need to click he's colony, then the button with a fist on
(he need 72 control ticks to rebel)