If you've forgotten your password and cannot log in:
Go to the login page and click forgot password
Enter your email address
Click "Send Reset Link"
You should receive an email (usually instantly, but it can take up to 30 minutes) with a link that will guide you through resetting your password.
If know your current password and want to change it:
Log into Air and click on your name in the top right of the screen
Select "Account Settings" from the dropdown menu.
Click on the password row to edit it
Enter your current password and a new password
Click Save and your password will be changed immediately.