According to Last.fm I can create my own personal playlist.

I'm assuming it means I can submit my music collection to Last.fm and then they can come up with my own personal radio station.

I have registered at Last.fm and have my own personal userpage. But when I go into Amarok I can't seem to find out how I can submit my music collection to Last.FM

Whenever I go to Settings --> Configure Amarok --> last.fm I have these boxes to fill out, including my Last.fm username, password and "last.fm services". When I click "apply" and then go Engage --> Play last.fm stream --> Personal Radio, Amarok tells me that "This feature is only available to last.fm subscribers" (which is silly because I AM a last.fm subscriber)

So.

1) How do I submit my music collection to last.fm using Amarok?
2) How do I set up my personal radio stream so that it can be played by Amarok?

problems:

Is a last.fm "subscriber" a person who pays last.fm for additional services? I did not pay. I simply joined up with username and password.

a last.fm subscriber is, as you guessed, someone who financially contributes to last.fm. There are certain features that are only available to these people. You can find more information about what the various privileges for subscribing are at http://www.last.fm/subscribe/