Place primer into loading port with brass facing up towards front of rocket
Using small blunt tool, push primer and ensure it is fully seated into rocket. Do not push primer from bottom, as this will cause permanent damage to grooves. If primer is not fully seated, grooves may be damaged on impact.
To reload, use a small blunt tool and push in from the round hole on the other side of the rocket. If there is strong resistance, pinch/pull directly above rifling collar to ensure firing-pin/plunger is fully retracted. Ensure there is not a buildup of powder residue preventing extraction.