To post a link just change the < and > to [ and ]
copy and page the url like this - <url=http://www.discusscooking.com/forums/showthread.php?t=15853>Spaghetti Squash</url>
it's similar to html but just a tad different - when I use the correct brackets [ and ] it looks like this
To copy and paste a recipe you just highlight what you want to cop so it all turns dark blue, right click and click on "copy" then go to your post where you want to type it, make sure your curser shows up and right click again and click on "paste" - your recipe should show up.
To post an image you need to right click on the image, click on properties, copy the url address and go to your post then paste the url address in between [img]paste address here[/img] - making sure there are no spaces in between the brackets.
with proper brackets it looks like this
Most bulletin boards use what's called Bulletin Board Code or BBC - just do a search for BBC commands or something similar.
If you are trying to download an actual picture you may have to download it first into something like photobucket then use the [img] and [/img] commands around it - but that will be obvious when you get there.