I'm in room with UV lamp and I can't read the keycode I have a blank note but when I try to use it it doesn't work... What can I do? Wham I'm doing wrong?
get the latest update for penumbra that fixes an error where you can only do this in one way.
or i think that you need to double click on it in the inventory to use it, or maybe move it to a quickslot (1-9) and then press that key or somethign like that.