UNIPRODO UNI TRAILER 18 Manual De Instrucciones página 17

3. Install the front wheel of the stroller, tighten the swivel nut clockwise.
4. Install the two tubes securing the handle to the frame on the back of the
trailer.
Slide the mounts all the way in until they secure. To remove the handle, push
in the metal ball on the left and right sides and slide the tube out.
5. To hook up the tow bar, unscrew the left nut from the bicycle axle
(A).
Attach the hitch to the axle and reattach the nut. If your bike is equipped with
a quick release (B), remove the quick release from the bike and pass it through
the tow bar with the quick release axle.
Put the quick release through the hollow axle in the wheel again, tighten the
nut and clamp the quick release.