Forum:Yu Gi Oh PC Game - Yugi The Destiny help needed.

I baught the game a few days ago and i'm in need of help, I have fusion cards and multiple times i've had the cards needed to fuse the card i want but i can't seem to do it i've had the cards in my hand and clicked around and i've had them on the field and attempted multiple things, how do i fuse cards? help will be greatly appreciated.