To assemble the ramp for your 1:64 Grave Digger RC: 

• Remove the two green plastic ramp frame pieces from box
• Bend the cardboard to match the curve of the ramp
• Insert one edge of the cardboard so that the notch lines up with the tab of the frame
• Repeat with the other side of the ramp
• Push ramp up against a stable object, like a wall or furniture before attempting stunts
• If having issues with the cardboard, make sure to gently bend the material into a curve before pushing into the frame