Task:  Open the Yahoo Mail App, Select an Evernote Email, Go to the three Dots to Unstar the Email. 
Steps:
Open the Yahoo Mail App
Swipe up to see the Evernote Email 
Swipe up to see the Evernote Email 
Select the Evernote Mail 
Go to the More Icon in the bottom right corner of the screen 
Click on the Unstar Option to  Open the Yahoo Mail App, Select an Evernote Email, Go to the three Dots to Unstar the Evernote Email.