WordPress.org

Where is the official page for this plugin/widget?

You can find the official development page here.

Where do I find the SmugMug RSS feed to put in the widget?

At the bottom of your SmugMug login page, you should see a link named Available Feeds. Click that link and select the RSS feed for Recent Photos.

Why do I not see any images?

One common reason you may not see any photos is that this widget only works with publicly accessible photos on SmugMug. If your albums are private, this widget will not be able to retrieve them.