How to collect profit from shops in settlements? (Fallout 4)

How to collect profit from them? It is written that the income is proportional to the residents, but somehow I cannot understand how to raise money then. Or at least after some time. And yet, this is a bug, or it should be, if you put an ordinary settler (who came himself) to trade, then he simply does not have a menu, or there is but it is empty there.