"3rd edition rules" refers to the third edition of the Advanced Dungeons and Dragons rules system.
The original rules (1st ed.) and the second set (2nd ed.) were published by TSR. Then TSR was bought by Wizards of The Coast (most famous for Magic: The Gathering card game). If I recall rightly, WOTC now is part of Hasbro.
In any case, the most recent reworking of AD&D is the 3rd edition, which changed a great deal since the 2nd.
None of that, however, should affect chapter 4. Perhaps you could give us some details on exactly where you're stuck?
Nightowl2
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