Changing your email address on file with your program is a bit tricky,
and it is not something you can do on your own.
The membership software sets up your account at the time of purchase,
using the email address used at that time as your login username. Once
that username is established, it cannot be adjusted or changed.
If you attempt to update your email subscription using the email adjustment
form, it will, in essence break your paid membership.
It is best to retain the original email address if at all possible.
If you are unable to do so for reasons such as change of job, change of cable
provider, etc, you will need to contact the support team to help you ensure
your account will remain functional after the change.