That's not the power cord going to the speed switch. You don't need to get those screws off.

To replace the cord:

Cut the old power cord near where it enters the blender.
remove the two front screws, pull off front housing.
remove 1/4" nuts found in recesses of exposed front plate.
pull speed handle out far enough to get a screwdriver under exposed front plate, and pry gently. It'll come off as it's a friction fit.
cooling fan blade is now visible, you need to remove it.
pry up gently on the teeth attaching it to the motor shaft.

Work your way around the 4 sets of teeth, it'll come off. Don't lose the two washers.
unscrew the electrical contacts.
take off the speednuts holding the brush assembly in place.
gently pull up on the brush assembly with a needle nose, until it comes out.

now remove the screws holding the motor coils in place. They're the same ones the speednuts attached to, and have hex heads you can get at with a needlenose.
once those are out, pull on the motor coils gentle, and wiggle them out of the housing.

You'll see the stub of the old power cord at the back of it.

Get a round replacement wire of the right diameter, thread it through the cord hole in the blender, and connect it up to the coils.

-I had to drill the power cord hole 1/16" larger than it was to get a modern cord to fit through it.

On the stub of the old cord, you'll see a metal ring which serves to anchor the cord in blender body. remove it (screwdriver + needlenose and pry), and attach to new cord at the righ position.

Put everything back together, being careful not to bust the carbon brushes.

Congrats, you now have a functional blender with a cord that won't try to electrocute you.