Q. How can I add an rss feed to my libguide for new aquisitions for particular collections?

Adding RSS feeds is very simple in guides. When adding a new box just select RSS feed. Once box is created, enter your feed URL. I like to play with the settings available on the page to see how the feed will look.

FYI, if you go to the Community page in your guides site you'll see options for Springshare Lounge and other support. Some good stuff out there.