Installing Feedreader

Run FeedReader.
Click on File > New > then Feed (or press the F3 button).
Type the URL of the feed in the black box below, then click on OK.
Now the feed and all the items for the feed will appear.
You can read a specific article by clicking on the headline in the middle column. Next, click on the "grades page" link in the third column over.
The page will appear in the third column over. You can open it in a browser (Firefox, Opera, etc.) by clicking on "Open in browser". You can also click "Back to feed" to return to where you were before.
I'd also suggest that you click on Tools > Options (or press F12) to edit the options for the program. There might be some preferences in their you'd rather have. You can also click on View > View Layout, and select a different view. I like the classic view probably the best.

Adding a Feed Manually to FeedReader