Where can I find the RSS URL on blogspot?

The
answer simplified!
RSS is the address of
the most RECENT blog post from your
blog. It is NOT the same as your homepage or blog URL. 
For instance my blog
address is http://louisewise.blogspot.com
but my LATEST post written (the address is usually found when clicked on the post
title) is my
RSS URL.
Still struggling?

Try adding  /feeds/posts/default?alt=rss
after your ordinary blog address.

Example: http://louisewise.blogspot.com/feeds/posts/default?alt=rss