Sure, are you having any particular problems? If not, the basic run-down of installing an RSS reader via Softaculous is:
1) Login to CPanel
2) Scroll down to Softaculous, under Software tab.
3) On the navigation menu on the right, select "RSS."
4) Click on either "Gregarius" or "SimplePie"
5) Click "Install" on the next page, and follow the steps.
Like I said, if there's any particular step you're caught up on, let us know.