[Chato's Mama]

I am trying to teach my baies to ring the bell but nothing!! I ring it everytime I take them outside. one step that I am missing is that I do not praise them when I ring the bell for them before going potty. Well CHato do not know how to let me know that he needs to go. IF I take him out he goes potty but if I am doing something else he wont do anything to get my attention until I start smelling it inside the house. I do not know how to teach him to let me know. The bell is not making much. What am I doing wrong or what do you suggest?

Thank you