I’m sure I must have known how to add a subscription at one time, since I have a number of them, but I can’ see anything obvious on my home page (http://www.newsblur.com/) to let me add a new one. The only place that looked relevant was the “Search Sites and People” box, but that didn’t do it; when I pasted in the URL for the blog’s RSS feed, I just got “Sorry, nothing matches.”
The blog I’m trying to subscribe to is fairly new, for what it’s worth: http://www.paloaltoforward.com/blog.rss