To answer your question -
Either press the quote button on the user's post you want to quote or use the following BBCode without spaces.
Syntax - [ quote="Username_here" ]quoted_text_here[/ quote]
example -
GLadOS wrote...
We're a lot alike, you and I. You tested me. I tested you. You killed me, I... oh no, wait. I guess I haven't killed you yet. Well... food for thought.
And as per the FAQ topic, you can always add to the existing sticky topic. But users who are likely to ask doubts covered in the FAQ, are the ones who NEVER look at sticky topics/ FAQs and the likes. That's pretty much a law in the interwebz.