Hmmm how do you create a link to another thread?
First, go the the site that you want to reference and right-click on the url at the top of the browser screen. From the dropdown menu select "copy". Then return to the forum and prepare to make your reply.
When you are on the "Reply to" page, you'll notice some "Instant Markup" options below the box where you type in text. Select "URL" and you will be prompted to type in the URL. Place the cursor there and right click; select "paste" from the dropdown menu. The next screen after this is entered allows you to enter whatever text you want to indicate that this is a link to information... Then just proceed with whatever else you might want in your reply.