To update your email address, just follow along with these simple instructions:
Log into the app and go into the More menu denoted by the 3 horizontal lines near the top right of the screen.
Then click Edit your profile under your name.
The final step is to simply tap your email. This will pull up your device keyboard. Press backspace until the old email is erased, then type in your updated email.
Please note: You will be required to verify your new email address before you are able to withdraw your funds. For instructions on how to verify your email, read here.