My baby is 21 mnths old and he is not doing potty on the potty seat and after doing potty he says mamma potty what to do

A. Start taking your child to the washroom every two hours which would be benefiting for you because this only you will be able to toilet train your child if you explain your child the kind of pressure you will feel when you want to pass motion and slowly you will see with regular practice and effort your child is going to learn it better