How do i make it so you can buy perks with a trigger or something? Cheers

I don't know if this is the right way to do it but this is how i would do it.

1) get the perk prefab out side of teh map. Stamp it

2) move the prefeab's trigger to where ever u want the trigger to be.

I think he means more like the wonderful machine where you would purchase a random perk from a trigger.
This would require scripting of course.

Basically you would need to get all perks into an array, then have a loop on the trigger waiting until a player triggers it, check if the player has enough money to purchase a perk - if they do, take money; if they don't, just use a continue to skip back to the start of the loop - then randomize the array, and give the first perk in the array (since its randomized) - like perks[0]. Finally, check if the player already has that perk and if they don't, give them it, if they do randomize it and try again.