He may be more interested in just watching at this point. Role models take the mystery and fear out of new things, so let him watch. After about a week of familiarizing him with the potty with his clothes on, empty the contents of his diaper into the potty, so he sees what's supposed to go in there. Praise him for his success and brush off accidents or no-shows. They may be fascinated by and proud of what they put in the potty.
Some children also like to wave bye-bye to their BMs.
Be careful not to push your child or nag. Just like grown-ups, children are much less receptive when someone is constantly on their case than when they feel like they're in charge. Instead, watch your child for changes in posture or facial expressions that signal he has to go. If he grabs himself or grunts, for instance, let these be your cues to gently remind him about the potty. Handle accidents and setbacks calmly and kindly.