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(Copy into from product description)
General notes:
Don't force anything; flexy bits are fragile. If it's not going together smoothly, something's misaligned, don't force it.
No screws or hardware; everything click-fits. There will be a slight rattle when the case is assembled; this is normal, it's not falling apart.
Assembly:
Remove SD card and any connectors
Peel paper
Pop out spacer in Network hole
Four sides have ports labeled…these help indicate inside from out. (note esp. the HDMI side, which is almost, but not quite, symmetrical)
Install ribbon cable (if used). No room for strain relief! Remove it. Pin 1 stripe goes toward SD card end of board, ribbon goes straight out (don't double over, no room).
Position first side
Position spacer
Position bottom (no markings – any orientation will do)
Position top. Can also leave this off for max access to GPIO pins and JTAG header.
Position second side
Position first end: hook piece over two "claws" and pivot downward into place. It should go without force. If you're forcing, stop. Did you position the HDMI side reversed? Flip it and try again.
Position second end: same idea.
Reinstall card and connectors.