If I understand you correctly, you merely want to create a link on your website that a user can click to be taken directly to another website?
If so then this is the code you will use:
<a href="http://www.theirsitesname.com">click here</a>
Obviously the text "click here" can say whatever you would like it to say but that is the text they will click to go to the other site. The value of the href property is the url for the site you are linking to.
Let me know if this helps or if there is something else you were looking for.