For starters sign up if you have no account in the service where you want to have your account. To do this you need to go to the page of the mail server.
Scroll down the page to the form to login to the site. In it you will see a link called "Register". You should follow the offered link to create a new account. You have to come up with a username and password. Pick a passphrase, consisting of letters and numbers to protect your data from hacking. To create it use at least ten characters. Save all the entered information and remember them, writing them in a safe place.
Now try to change your email address, if you have a check on the mail service. To do this, go to the main page of the mail server, i.e. log in. Just enter your username and password. After successful login you should go to your personal settings. It can be your "Personal Cabinet" for My profile. When you log in to your account, then you must find the item "Change personal information".
Click on this link. You will be redirected to the page to change personal data. In the field "E-mail" need to remove current email address, and write another email. Don't forget to save all changes just by clicking on the desired button. So you made an operation to change your email address.