Costway SP37501 Manuel De L'utilisateur page 5

Take the two handles(1) out of their plastic cover, and insert
them into the right and left parts of the stem(7). For each of the
two handles, you should hear a "click", indicating that the
handles are engaged. Check that the two spring buttons(6) are
effectively out and visible. For the scooter with suspension,
open the handle quick-release lever(2) and follow the
instructions below before tightening it firmly.
Open the steering column rapid tightening lever(8), adjust the
height of the handlebars until you hear a "click", indicating
engagement in one of the two indexed positions, then firmly
tighten the steering column rapid tightening lever(8).
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