To access your Bluewin e-mails on your mobile or through a program such as Microsoft Outlook or Apple Mail, you will need your Bluewin e-mail address (as the user name) and your Bluewin e-mail password. You have set this password yourself in My Swisscom and you can change it at any time.
The instructions for setting up Bluewin e-mail on your mobile or computer/laptop can be found here.
To access your Bluewin e-mail through http://webmail.bluewin.ch/, log in with your Swisscom Login user name and password. Do you have multiple Swisscom Logins? Go to My Swisscom to find out which Swisscom Login your webmail is linked to.