Vaggan DMFG 18900VU Mode D'emploi page 17

Align 3(right legs) with 1(firebox right panel),lock the upper hole with D(screw),lock the below
hole with (A) screw
Align 4(left legs) with 1(firebox left panel),lock the below hole with (A) screw
Connect 6 (bottom shelf) to 3,4 (the legs)