Remove the previous insole from your shoes

Trim (ONLY) the toe area of the 2620 insole to fit your shoe, (use your previous insole as a template)

Attach L1 arch piece to the left foot orthotic in the most forward position (or 1 click back).

Attach L2 arch piece to the right foot orthotic 2-3 positions back from the most forward position.

Place both orthodontic insoles into the shoes.

Walk around for 1 minute.

Decide which one feels best and adjust the other one accordingly to match.