Follow these steps:thank you to Patrick Spicer (Adelaide's dad) for the tips!
Here's the procedure on a Mac using most browsers:
1. At the bottom left of your blog is a link: "Subscribe to: Posts (Atom)"
2. Clicking on that takes you to a feed page.
3. On the right side of this feed page they will see:
Actions:
Update Now
Mail Link to this Page
Subscribe in Mail
4. If they use Mac Mail for their email, they can click : "Subscribe in Mail" and their email software will pop up with an entry under "RSS" on the left of their email window underneath their mailboxes.
5. When they click on this new entry they will see a listing of all the current blog postings, just as if they had unread emails in a mailbox. They can delete the ones they've read, and then when you post something new a new unread item will pop up in there.
6. If they don't use Mac Mail, there are other options. For example, Google Reader can subscribe to feeds. They would simply copy the link to the feed page and supply that to their RSS feed reader software.