margrave:the curse of the severed heart

is there a walkthrough for the game as i am stuck in the blacksmiths where you are suppose to blow the horn at the bridge gauardians but i cannot find anywhere to do this

hopefully you have already gotten this.....if not here goes...if you already have the horn..and are in the blacksmiths building you will go to the right to exit to the bridge...click on the guardians it gives you a close up then grab the horn out of inventory and click it on one of the guardians