Hi! What do you mean by linking to the anchor in the theme settings?
Typically, to create an anchor, you would add an ID to the markup of the text. Here’s an example for the webpage http://www.mysite.com/page:
<p>This is my text. Here's my <span id="the-id">anchor</span>. Hope you like it!</p>
Then, to create an anchor link, you would add a reference to that webpage, follow by a slash, # and the ID:
<p>Here is my anchor. Hope it works!</p>