Why I Cannot use my Lure Module even i'm on Pokestop?

Have you been able to use a Lure Module before?

If so, make sure your clock time of your phone has been set correctly and not manual. The other day I received 0 pokemon from my incense and after some research I think it had to do with a wrong clock date. Perhaps the same goes for Lure Modules.

You have to click on the PokeStop then click on the thing right above the coin. (pill shaped) You can't use the lure from your items list.