This is where you fill in the Username and Password for your last.fm profile. If you do not have a profile you can register at the last.fm website.

Improve my profile by submitting the tracks I play: allows Amarok to submit your played tracks to your last.fm profile.

Retrieve similar artists: this will cause Amarok to request, from last.fm, a list of artists similar to the one you're listening to. These are also displayed in the Context Browser. Note: you do not need a last.fm profile to recieve similar artists - simply check this box.