Changing your email is simple, just open up MISTPLAY, click 'More' and then 'Settings'. Change the email to your new address and hit SAVE, thats it!
Step 1: Open up MISTPLAY and hit 'More' in the navigation pane
Step 2: Click on "Settings"
Step 3: Change the email to whatever address you want and click SAVE
Congratulations, you've successfully changed your email on MISTPLAY.