Zara,
On the bottom of the posts, there are two boxes labeled “Reply”. Use the one on the left. When you do, you’ll see a row of icons just above the input-capable message area. Clicking on any one of those icons will prompt you thru selecting various functions for your post such as the graemlins (Razz, Smile), colored text, bold, italics and quoting. If you want to quote something you can highlight the text and click one of the “Reply” boxes, and the selected text will be included within the quote code/function. This will also work for multiple quotes, but each one requires selecting and clicking the “Reply” until all the quotes have been included.