@Mayer,
Hello Friends,
You cant and don't, your stock bumper is not reinforced enough to properly handle the forces a wench will make when pulling your jeep, It could all easily tear off. Have a little patience and save up for a good bumber, Also see if you can get lucking in bidding and check out e-bay there are some real good winch bumbers for your jeep. and if you or a friend knows how to weld call these guys and see what they have, you DIY, they have a kit for you.
Thanks and Regards,
Umang Kumar