How to load a DE blade in a Merkur Progress...
Step One - Grab plastic adjustment knob at the bottom of the handle and twist counter clockwise.
After Approx. 6 good twists the top apparatus will be in its full open position and will be "loose."
Step Two - Pull the top apparatus off of the main housing/handle.
Picture of seperated razor...
Step Three - Carefully insert a double edge blade into the top portion of the razor. (the blade is NOT properly lined up on purpose to illustrate the blade - refer to the next picture to see how it "should" look.)
Step Four - Place lower main housing/handle onto the top housing (lined up)
Step Five - Twist adjustment knob clockwise to "lock up" the threads and tighten/secure the two portions of the razor to one another. Tighten all the way (as far as you can turn clockwise) then select your desired numerical "aggression" setting.
There you have it - you are ready to get ashavin'