Step 1:
To attach the Supplies Tray (B) to the Blackboard/Whiteboard (A).
Remove the two black plastic covers protecting the two bars on (A1).
Turn both (A) and (B) upside down and align them horizontally.
Snap the hooks on (B) to the bars on (A1).
After hooked, rotate (B) to make it perpendicular to (A).
Step 2:
Lift the wider part of A2 of the Blackboard/Whiteboard (A). Then unsnap the narrow area of part A2 and move it
towards the Supplies Tray (B). Insert the narrow part of A2 into the slot on the back of the Supplies Tray (B).