This should be on the service board and not on the gambling board; it's a casino you are selling, which is true, but anything relating to service is either on the service board or on the market place. 
 
Check on the bottom left of this thread. You can see a place where they wrote "Move." Click on that option and use the instructions that will be provided to you. Select the specific board you want to move the thread to, and then click on submit or move. You can either move it to the service board or market place, but I suggest the service board is best for the thread.