After removing the rear blade guard, the next step to changing a band saw blade is to loosen the under-table guard. There are typically a few blocks and adjustment wheels found underneath the table, as well as a wrap-around guard to help keep the blade in place in the event of a breakage or if the blade were to come off track.
To access this blade guard, pop off the plastic center from the middle of your saw table with a screwdriver, and set this center aside. Then, look down into the hole and locate the screw that holds the protective wrap-around guard in place. Loosen the screw that holds the guard in place, then rotate the guard 180-degrees until it is out of the way.