Set the date range you want.
Set Select Type of Report to Keywords.
The page will refresh.
You can filter your report by Keyword. Just click on the downward arrow and select from the list which appears.
The page will refresh to your filtered report. In the image below, we chose 'Breeze Incoming' (turquoise arrow in image below). Your report also shows the total number of subscribers for each keyword related to that group (gold arrow in image below).
If you need a more detailed report of a list of who texted a keyword, check out this article HERE.