Mary,

When typing a post click on the URL button below under the Instant UBB Code column. It will pop up a box. Enter the actual web address (http://www.catsailor.com for example). It will then open another box. Enter the name of what you want to cll the link. You can name it anything, like "Catsailor", or "here". If you put the whold address in there again it will show up as a link with the actual name (it will look like http://www.catsailor.com rather than some other name (like "here"). I have noticed that it will usually put the link at the bottom of your message so you might have to cut it and paste it where you want it. I know it seems confusing but once you do it once or twice it becomes second nature.
I hope this helps.