To load or change the blade: unscrew the handle from the head by twisting it anti-clockwise. Insert the blade between the two parts that form the head. Screw everything back together. Tighten it. You will see that the blade is curving: this is what we are into for a non-aggressive shave.
To shave: wait the end of a shower so your skin and hairs are soften. Apply shaving cream, soap or oil. Apply short strokes while holding the razor at 30°. If it's your first time using a safety razor, we would advise you to apply absolutely no pressure, using only the weight of the razor. You will learn gradually the amount of pressure you can apply to get the perfect shave according to your skin - but it will be far less pressure than what you are used to apply with a plastic razor. This is the reason why we prefer to say "no pressure at all" for the first shave.
After shaving: pat dry your skin, rinse the razor under the water stream (with a little bit of soap if you prefer) and leave it to dry outside the shower or water stream to get most of its lifetime potential.