To set up an internal link, you need to code the destination anchor first.
Assume you have a large HTML file named SETUP.HTM, and you have an header titled "Installation Instructions" within that file. To set that location as a destination anchor for other source anchors, type:
<A name="Installation"></A><H2>Installation Instructions</H2>
Note that the opening and closing <A> tags don't contain anything. Now, you can create a source anchor that clicks to that destination location, as follows:
<A href="#Installation"> Go to the Installation Instructions </A>
Note that the anchor name (preceded by the # symbol) is used as the source anchor.