Seriously? Its been a whole day and he is not toilet trained yet?
Every kid is different, and it can take a long time. DO NOT force him, when he is ready he will do it.
Try giving him lots to drink, and then have him sit on the toilet for an hour. You will need to entertain him while he is sitting there.
Hatzlocha Rabbah, and no, cleaning up accidents does not become any more pleasant!!