VEVOR VV42 Mode D'emploi page 7

STEP 3:
Slide in crossbar (c1) between the vertical bars (b) and tighten it with two
screws on each side (Screw (T2) from the side and screw (T5) from the
top)
STEP 4:
Slide in crossbar (c2) between the vertical bars (r) and tighten it with two
screws on each side (Screw T2 from the side and screw T4 from the back).
Note: There are 5 holes on each side to adjust the height position based on
your chair height. You can change the height setting at any time just by
removing the screws T2 and T4 on both sides and tighten it back to the
position you want!
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