[HELP] Noob om alchemy

Hello there, I'm facing problem on how to use Void Rondo and how to get elements from .
I'm pressing (Y) but I don't know where to put the Rondo and press the "Fuse" tab :confused::confused::confused:

I'm playing with 21lvl wizard.

go in your alchemy window, then choose the dismantle tab.
then put your item in and press the button