Obviously, this is not a particularly well written question.
However, I'm not sure if it's actually too broad. I'm not overly familiar with Pathfinder, but DnD 4E's Player's Handbook contains a section entitled "The Core Mechanic" (page 11) which explains how dice rolls work in a few paragraphs.
It basically just says you roll a die and compare it to a DC, but with more detail and examples.
Seems like something like that would answer the question fairly well.
Did the user ever come back or respond to their question being put on hold?