To consult the Oraculum about the meaning of a dream, write down the numbers for the day of the week and day of the month on which you dreamed, the month you dreamed, and your age. Then add up the total. This gives you five numbers, which you them mark as being odd or even:
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*
**
*
**
This tells you which section of the Oraculum to look in.
You then do this again for the names of the day of the week, number of the day in the month, name of the month, and your age, and then total up the numbers so you end up with another pattern like above. This tells you where in the section to read.
I can't find any versions of this online, other than copies of books, so you'll have to take my word for it that it takes ages and the answers are as random as the method.