"You can find the paths for the interface icons by going to Advanced > Game Interface."
"And ive looked at all of the interface things but cant find the icon or whatever."
Well, in the game interface, it tells you what is what; so you can change them. Like it'll say: Icon - Normal Attack; or something like that, so change that into the imported file of whatever you want. Make sure you name it correctly though.
Example:
Noraml Attack Icon - UI\Widgets\Console\Human\infocard-attack-melee.blp
My imported icon name is infocard-normalattack.blp so I would change that imported file name to : UI\Widgets\Console\Human\infocard-normalattack.blp
Therefore the end result of it:
Normal Attack Icon: UI\Widgets\Console\Human\infocard-normalattack.blp
Hope I helped, if this isn't what you wanted to know; sorry.