It'll be fixed in today's patch! For the lipstick you should be able to just select it and use it on NPCs like the normal pump.
The problem is that I don't understand how to use the items from the hotbar at all, sorry
Ah, you can press "C" with an item selected from the hotbar (select it to the slot by hitting "Q"). There's a tutorial on it in game in the glossary!
Oh, thank you. As I understand it, I can't interact with all NPCs?
