show the product stock in the product page??

If you entered a quantity for your product, it should appear automatically on the product page along with the add to cart button. If you don't have the add to cart button, that would explain that you don't see the stock.
If you don't see the add to cart button, it's probably because you activated the "catalogue mode" option or deactivated the option "Display 'Add to cart' button" option in the Display tab of the configuration.