How do I upgrade my existing Registered User account to a Member account?

Upgrading your existing account is simple. Just log into your account. Once your account is verified you will be taken to a "Welcome Back" screen. There will be a button there to upgrade your account.

Another way to upgrade is when you are logged into your Registered User account you will see your Handle at the upper left of any page. There will be an "Upgrade" link next to your Handle.