Only assign one affect to one interaction action and not all actions

Hey, im new to webflow and im trying to make this webside.
I sort of copied what another webside did, and i wanted to make dropdown text boxes.
But everytime I go into the interaction field and create an action, I can only assign classes to all of them at once and not to each seperate different classes.
Does anybody know a fix?
thank you
Btw - here is the original i wanted to copy for myself to try.

Here is my public share link:
(how to access public share link)