If you to User CP and edit your profile details, everybody here will know what kind of bus you have and where you are - helps us tailor answers and advice.
Pictures help with something like this, although you need to make 5 posts on this forum before you're allowed to post pics (you can post links to pics hosted elsewhere, though). The stairs on a bus are usually just a one-piece unit made of folded sheet metal. The bottom step sometimes (always?) has a strip of rub rail attached on the underside to stiffen it, so perhaps you're inadvertently trying to pry the bottom of the step away from this stiffener (which you don't want to do).