How do i make a script that...?

I need to make a script that inserts a animation into a npc while the npc is anchored(humanoidRootPart Anchored) so it plays the animation but im not good at scripting at all plus i think i need to do something with animation controller but i dont know what to do with it!

Please help.

Fixed it needed to change a few lines of code ;d but it works!