Slide the blade holder all the way out, press on the tab as shown in picture. Pull on blade with other hand. Blade slides right out. 
I find that the Stanley QuickSlide Utility Knife (STHT10828) also accepts Ace Hardware brand Heavy Duty General Purpose Cutting Blades (,024 inch thick).(Ace Hardware Item # 23305.)
SOURCE: How do you load a new blade?
At the back end of the knive (the curved end) press the black piece through the yellow rounded part and the yellow front and the black back will part, now slide the yellow part back to reviel the blade folder. Fit new blade then refit the yellow part on top of the black part and slide the yellow part foward to lock it back in.
SOURCE: WAS ABLE TO OPEN THE STANLEY SWIVEL LOCK UTILITY
If you use the wrong brand of blades, they won't let the knife shut all the way. The notch is cut slightly differently. The same is true for the Kobalt knife I just bought at Lowes. Get the Stanley blades that are right next to the knives - they are the only ones that work.
Sorry.
If you bought the Stanley blades, then I don't know what the problem is. Sorry for that too.
You do not have to remove any screws. Extend the blade outward
using the thumb slide on top of the knife. There is a small black pushbutton on
the opposite side from the lock button. Depress the button on the side and
using the other hand, grab the blade with your thumb and forefinger to pull the
blade out. It may require a little wiggling. Now the new blade can be slide in
and locked into place. The black pushbutton controls the locking mechanism that
keeps the blade from pulling out.
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