Hi,
Yes you need to advertise the RSS URL on your website. There are some simple things you can do, the most basic is by adding a sidebar widget. To do so:
1. Login to your WordPress admin portal.
2. Navigate to Appearance > Widgets.
3. Add a Text Widget and add the below code.
<form style="border:1px solid #ccc;padding:3px;text-align:center;">
<p>
<a href="https://feeds.feedburner.com/RiversIHaveKnown-BooksReviewsAndMore" target="blank">Follow me on RSS</a>
</p>
</form>
This will display a linked text “Follow me on RSS” in the sidebar. Alternatively you can find a RSS logo and instead of having text you can add the logo. So instead of ‘Follow me on RSS’ you can simply add something like:
<img src="link_to_image" alt="Twitter Logo" width="44" heigth="44"/></a>
That should be it. Hope it helps.