To convert your crib to a Full Size bed you will need to purchase a set of full size bed rails (hook style for headboard and foot board). You can find this at any discount mattress store, or furniture outlet, it can range in price from $39.99 - $99.99. To install the rails you will see slots with bars on the headboard/footboard, this is where the hooks on the rails slide into. There are no bolts used to secure the rails to the headboard/footboard.
Jardine enterprises does not make a wood rail kit as was shown in some of the earlier ads for the Madison line of convertible cribs, and do not waste your time ordering the rail kit from Babies-R-Us as it is simply a metal rail kit (which you may be able to get cheaper at a local furniture/mattress store).
Use the lower daybed rail between the two front posts for the foot board. Another option for the full-size conversion is to purchase the metal rails (hook style) for a headboard only and not even bother with a foot board.
If you are still unsure of what you need to do for the full-size conversion please feel free to email me at [email protected]