You take those 2 tiny screws out...Take the screw which holds the head on, off...Take the head off, and those two sides where those two tiny screws were...Bend those out....

.....I know it sounds scary, but those tabs are meant to be bent out....then push the neck that the head was attached to, towards the handle and everthing will come out in one piece....clean and reassemble in reverse order....
Big tip...if you oil it...then wipe off as much oil as possible...it that slide that racks the new blades in is damp with oil, the new blade can stick to it and Bingo! It will jam!...Then you have to take it apart again...ha,ha...But its all fun...But it that slide, and the blades are dry, you shouldn't have any probs...
Heres a video...Notice the disassembled C type has those tabs bent out....