To change your password:
Open the UG app.
Navigate to the Profile section (upper right corner of your screen).
Settings (Gear icon)
Account information
Set password
To change your email address:
At the moment, you can only change your email address through the website.
Log in to your account on our website ultimate-guitar.com.
Go to Settings.
Click Email.
Enter the required current and new details.
Click Update.