Yes, found it.
At first I was looking at the hot buton "buy", but couldn't find an option there to put my SN in.
I expected it to be there.
Later when I checked the other options on the menubar I found it.
Thanks for the reply.

Greetz Eric

Hello,
I just upgraded from WebAnimator 2 to version 3 and paid for it.
How do I put my serial nuymber into work?
I can,t find any option to do it!

Eric Meersmans