This can be a fairly tricky puzzle if you have an older edition of the book. Once you have a few basic understandings about the page, however, it becomes fairly straightforward. The solution is found in the 8X8 grid of squares, the numbers in them, the jewel like symbol in the upper left of the grid, and the black squiggly symbol in the very bottom right hand corner. All else on the page can be ignored as irrelevant to the solution.
Below are a series of graded hints leading to the final solution, which is ultimately a 6 digit code:
And the final solution is below. DO NOT CLICK IF YOU DO NOT WANT TO KNOW THE ANSWER!!!