Not only is the answer yes, it's an extremely painless process!
You need to log into your account using your current email address and password. Once logged in you will notice a panel on the left hand side. The very top portion of that panel will illustrate your most important account information and a button offering to edit that information.
Should you choose to click edit, you may change the email address associated with the account. Make sure to save after you are finished to complete the process.