does this help (from the help section)?
Replying
To add a post to the topic, simply scroll to the bottom of the page, and start typing in the reply box.
To quote another post in your reply, you can either click the Quote button beneath a post, or use the multiquote feature. Multiquote is used when you want to quote more than one post in your reply. Select the Multiquote button underneath the posts you want to quote, and you will notice that the button will change color. At the bottom of the page, you will notice an informational box appear with the total number of posts you have added to multiquote. You can multiquote from different pages in a topic, or even different topics in the forum. When you are ready to post a reply with the posts you have quoted, simply click the "Quote Posts Add Reply" button.
Mind blown.