In general, that should be all you need other than maybe rediscover the device. In the Edit > Applications page it’s called “Random entropy” though it is positioned in the list as if the name were just Entropy alphabetically.
If that’s not there in your app list you might want to make sure your installation is up-to-date. I believe that app was just added a couple days ago. My version is: 1.38-59-g253ae82 - Mon Apr 16 2018 09:06:23 GMT+1200