You'll be able to do it in no time!
2. Insert battery (V23a) (pay attention to + and -) and test LED (on/off).
3. Insert the lower part of the LED into your stirrup.
4. Insert the step surface from above.
5. Tighten the M4 screws (included in delivery) with a suitable Allen key (size 2.5mm). Caution: Do not overtighten to avoid tearing the material.