How to create a simple BP for an enemy to slow his movement speed down when he is going over a box collision which should trigger this ?

What is this “Set Stencil” function ? Just figured out the get node after it i miss this function tough and the math expression

here is how far i get just again the last 2 nodes i cant do them

here is what i could do the math expresion when i open it it say its “read only”
so afcourse this is still not working and i cant belive that is so hard to finish this last 2-3 steps requiered… instead of the Stencil function whatever it is i could only make a SET one and its not working the math expression is wrong so it does nothing

here is the math expression is read only for some reason

hey man can you later point me out how i could finish this ? Would be greatly appreciated for the help. I’m revisiting this trap scince weeks and i couldnt make it work till now i hope with the last steps that are requeired that this can finally start to work ty