J.Z.
Honestly when a child is ready he or she will just go . The important thing is for you to cheer him on. You gave him the supllies he needs (potty) youve explained what its for and the rest is up to him. You can ask him sporatically through out the day do you feel that you need to us the potty ? But other than that when he is ready he will go. Thats great that he awknowledges that he needs to go the potty to pipi. And just the fact that he sits there is awesome. Beleive it or not mom you have begun potty training. IN the begining potty training is filled with 80% - 90% false alarms than actually him using it. Before you know one day he will get up and go to the potty without even asking for help. Youll see one day it will just all come together. Just dont push him to hard you know. 18 months is great that he has the concept of potty but he might not get it all together too fast. My son finally got the hang of 1 month before his 3rd B-day. YOu are doing just fine.