Nah, you can just post using the 'Quick Reply' box at the bottom, but it is just a general reply in the thread. You're not anyone. You can do this by clicking the
button.
If you want to quote several people in the same post, you click the
on the first (few) post(s) and they will turn yellow. On the last post you just click the regular Quote button.
If you want to add information to you post, and no one has posted in the meantime (meaning your own post is the last in the thread), you click the
button.
Nice paint job btw, but for me personally it's something that I wouldn't do to my case