For a written guide look under this video
Next to your username there is a choice "Administrere konto".
Sign in to Verji, this is where you change your email and phone number.
When you're done, click the Verji logo in the upper left corner which will send you back to the Verji client.
If you receive an error
It is important to be on the same device when you are changing your e-mail address. If you have Verji on your PC/Mac, and e-mail on your phone, the devices will not communicate properly and making the change will fail.