I just wrote this as a comment here, but my stunning display of technical skill amused me enough to post it here.
In the er thingy above the box where you type your post, what is it called where all the lil symbols are?
Anyway, in that thingy there is a lil green blob which looks like a monster with teeth in between text colour and some straight lines.
Select the text you want to turn into a link, like click here, then Click on the green tooth monster and it'll give you a space to put your website addressy thing.
Impressed? I'm off to apply for a job in technical support ;) lol