@SydneyBeems : To quote a single post, click Reply at the bottom corner of the post. A window will open with the quote already in it, and you can add your reply above or below it.
To quote multiple posts, click +Quote at the bottom corner of each post you want to quote. (You'll see it turn into -Quote.) When you're ready to reply, go to the "Write your reply" box at the bottom of the page and click the Insert Quotes button at the bottom corner of the box. A window will open allowing you to choose which quotes you want to insert into your reply. Then you can add your reply above or below it.
(I hope that's a little clearer than mud ... )