You can insert standard HTML code into your bio to make a working link. But you have to know basic HTML.
I can't show you the complete code here, because it would only show up as a link. But try this. Copy and paste the following into your bio:
a href="http://insertwebaddresshere.com">WEB PAGE TITLE HERE (no spaces).
Where it says insertwebaddresshere.com replace it with your page's URL (make sure the quotation marks remain intact).
Where it says WEB PAGE TITLE HERE type in the name of your website.
Hit SUBMIT in your biography editing page.
Now you should have a working link.