It's important to keep your email up to date as you'll use this to log in to the owner dashboard, and it's also the way you'll receive updates from Crumb.
You can easily update your email address from the 'Account Settings' section of your dashboard - here's exactly how you do it.
Are you trying to transfer your account to another person?
Check out this Article: Transferring a tag to someone else and look at "Option 1" for more information on that.
Log in to the app
If you're not already logged in, here's a guide to logging in: Log in
Open Account details
Click on the circular icon in the top right. It will either be your initials or your profile picture if you've set one.
Click on 'Account details'
Here, you can update all of the information of the owner (that's you!), including their email address. Once you have made any changes, be sure to click "Save changes".