YOTRIO 68840815 Instrucciones De Montaje página 6

First in the left seat side tube and SEAT BACK(E) pad a NUT WASHER(J), and then
the BOLT (M6*55) (G) inserted into the hole to connect the seat side tube and
SEAT BACK(E), and then under the back plate with WASHER (K) and M6 nut (I),
4 and then use the WRENCH (N) lock.
Then on the right side tube and SEAT BACK(E) pad a NUT, and then the BOLT
(M6*55) (G) from the bottom up to insert the hole to connect the SEAT
BACK(E) , insert M6 WASHER(K)and NUT(I), with WRENCH(N) tighten