Looks like some great instructions. If you still need help, you can tap the menu (the three lines) and scroll down til you see "App Support". Tap on that to send your question to our apps support team - they are best equipped to help you.
Here's how I do it on a phone app. Click on the 3-line icon (Upper left). Select Daily Diary. In the upper right of the Diary screen select EDIT. You should see minus signs by entries. On iPhone I can just tap to delete.