How do i level the deck on a murray riding mower model number 46576x92 twin i/c?

Park the tractor on a firm, level surface. . .
At the lower end of the lift/lower travel slot, there should be a plastic cover which you pop up so that your blade lift handle goes all the way down (it should say something about blade level on there somewhere. . . . .
After you have the handle in this position, look at the front lift arms of the mower deck and find the 2 large wing nuts, one on each side. . . . .
Loosen these while the deck is down and then retighten them Your deck is now level

Those wing nuts is the worst deck levels they slip u may have to purchase 2 more wing nuts if u have adjusted it a lot they wear out