Click by the link in design view, and then go into code view. You'll see something like this
Code:
<a href="url">Something here</a>
Change "Something here" to what you want your link to say. If it does not look like that at all, please post the code.
I would certainly recommend, if you haven't already, to learn at least the basics of HTML before using Dreamweaver (I did not for a long period, and it never went well). If you know a bit HTML you'll understand most of the code Dreamweaver generates and understand where it screwed up.