Help needed on "One life for one world" MSQ

I can get to the second part of the fight with the 5 but no further. It wants me to channel aether into Alisale but I have no idea how I'm supposed to do that. The game is not clear at all on how to do it, it just keeps telling me to do it without telling me how to do so. Can anyone help me? I know this seems like a silly question that I should know the answer to, but this is my first character and first time on this quest and sometimes things that should be obvious aren't for me.

https://www.youtube.com/watch?v=qwAiOqji2vo

That video should help you. Second part of fight starts about 8:56.

Thank you! I'll check it out!

Edit: OMG that helps so much! I knew I could click on her but not that I could click on the blade. Now I should be able to due this no problem! Thank you so much!

Glad it helped, hope you got it done.