Managed to pay, or more exact uppload the settings for a new e-card (the old one had expired). This how I did it:
In the spotify program:
1. Click HELP-YOUR ACCOUNT
2. Choose "Sign up for Spotify unlimited"
3. Then I could change the old e-card with a new.
But Spotify haven't taken any money yet, so I still have Spotify Freee - a problem I share with I others I read in the forum. Perhaps it's because Spotify try to draw money from me once a mounth according to the old e-card. I can't find anywhere I can change that. If In find a solution I'll publish it here. If my hypotese is correct my account will upgrade within a mounth.