Start by opening a Terminal by searching for "Terminal"
Now, to change your password, connect to mail.longnecksoftware.ch using the following command and change your password
ssh bot@mail.longnecksoftware.ch
Replace "bot" with your own username.
If you've forgot your password send an email to: contact [att] mail.longnecksoftware.ch
If you want an email on this domain, contact the admin on: contact [att] mail.longnecksoftware.ch