Wind adjuster back so the blade will sit at least 1mm back from the brass mouth. This will prevent the sharp edge from being damaged during the blade insertion.

To put the blade in, slide the blade bevel down the bed until the hole in the blade fits over the brass pin on the adjuster. Be careful not to bump the blade edge on any brass pieces. Then put the lever cap wedge loosely into position.

Holding the wedge in position with your thumb, turn the plane upside down so you can sight down the sole. Screw the adjuster until you can clearly see the blade and make the required lateral adjustment. Then retract the blade so you can just see the edge.

Turn the lever cap knob about 1/4 of a turn to hold the blade firmly in position and then try the plane on a scrap piece of wood.   If you need to further adjust the depth loosen the lever cap knob about 1/8 of a turn. Do the required adjustment, re-tighten the lever cap and then re-test the cut.  Repeat these steps until you have the desired depth of cut.

Note:  About 1/10 of a turn on the adjuster knob will give you a meaningful change in the depth.