It's easy to update your email though your Sampler account, simply go to your Profile page, and click the "Edit" button at the top of the "Your Profile" section.
Step-by-step: How to update your account email
If you would like to update your email you can do this easily through your Sampler account, just follow the below steps:
1. Login to your account
2. Click on the Profile tab
3. Click on Edit at the top of the Your Profile section
4. Enter your new E-mail and click Save. You're all set!