HP 510 - Manual (Page 189)

3. Remove the cover completely. Inside the
compartment there are two slots for a LAN
card or an Accessory card.
If you use an HP-GL/2 card, the LAN card
should be in the right-hand slot (nearer the
back of the printer), the accessory card on
the left.
4. To insert a LAN card (or an Accessory
card), remove the metal cover from the
appropriate slot by unscrewing its two
screws.
5. When you have inserted the card, screw it
into place, using its two screws (at the top
and bottom of the card).
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HP Jetdirect network card installation