It seems like a few people are having issues getting the hang of the "quote" feature. Fair enough! It's a bit more complex than the system Trademe use on their boards. 
Here's a quick rundown:
1) Quote a single post
Simply click the "reply" button below the post you want to quote and reply to.
Example image: https://i.imgur.com/LsjyKK1.png
This will open the "new thread" window with the selected post quoted. Start typing your message underneath the quote box (not inside it, as this will make your reply part of the quote).
Example image: https://i.imgur.com/JvyeSKO.png
2) Quote multiple posts
Click the "quote" button under each post you want to quote, then click the "reply" button under the last post.
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Hopefully that makes sense! Any questions, feel free to ask below
Here's a quick rundown:
1) Quote a single post
Simply click the "reply" button below the post you want to quote and reply to.
Example image: https://i.imgur.com/LsjyKK1.png
This will open the "new thread" window with the selected post quoted. Start typing your message underneath the quote box (not inside it, as this will make your reply part of the quote).
Example image: https://i.imgur.com/JvyeSKO.png
2) Quote multiple posts
Click the "quote" button under each post you want to quote, then click the "reply" button under the last post.
---
Hopefully that makes sense! Any questions, feel free to ask below