If you've recently changed your phone number or email you can change these in the app by following this walk-through.
Navigation to the Settings by clicking on the left hand menu.
Click on the top bar that has your photo, full name, and username.
From this menu you can update your profile photo, email, and telephone number.
You can upload any photo on your phones camera roll or take a selfie by clicking on the "pencil" icon.
To change your Email address simply click on the "Edit" button next to your email. You may be prompted to enter your password as added security. Enter your new email address and click on Save. You'll receive a confirmation banner on the top of the screen.
To change your Mobile number simply click on the "Edit" button next to your current phone number. You may be prompted to enter your password as added security. In this screen you'll be able to enter your home, mobile, and work number. Click on Save to update these new records. You'll receive a confirmation banner on the top of the screen.