This isn't really a programming question as much as it is a question about the basics of BBCode, but I'll answer it anyway.
In order to create a link, simple surround the text that you want with the URL BBCode tag.
[url="http://google.com"]Click here for google![/url]
Would display as:
Click here for google!
To adapt this to whatever you want, simply change "http://google.com" to whatever site you want (keep the quotes), and change the text. You can also link images by surrounding the image tag with the url tag if you wanted to try that. Anyway, I'll lock this thread because I've answered your question and this thread was misplaces (should have been in H&R), but feel free to ask me any further questions via a pm.