Ok, same steps. On widget page inactive widgets are below available widgets, look there.
Drag the one named RSS into the sidebar. Click the right end of it, and the options appear. They’re simple to follow, and simple to change when you want to.
When I loaded mine from a site, I didn’t use the “subscribe by bookmark” option, I didn’t understand how.
So I merely wrote down the URL showing one the screen & typed it into the RSS widget. I gave it a title, set the number of articles to appear, enabled the author’s name & date, and Bingo, it was working when I checked my page.