I would like to change my username after my registration, is that possible?

Changing your username after the registration is not possible, since your username is connected to the web-address of your albums.

Recently we have redesigned the login process. A free selection of a username is no longer possible; this is now created automatically since many of the requested usernames are already taken due to a large increase of customers.

Source: http://www.pixum.no/service/10401-i-would-like-to-change-my-username-after-my-registration-is-that-possible.html