You can easily log in to Nordweb's email service through webmail. Webmail works directly in your browser, so you do not need a separate email program.
You can also connect your email account directly to your preferred email program, such as Outlook, Thunderbird or your phone's email app. See the separate guide: Connecting an email account to an email program.
If you have forgotten your email account password, change it in your account: the Email tab, pick the domain and the mailbox, then Change password. The same path works whichever of our email services you have.
If your business does not yet have its own email, take a look at business email.