Welcome back
The account centre is for AOL 8. MSN Explorer does not use it - that client signs you up itself, in its own wizard; the MSN setup guide has the details.
Accounts are not created here. The account centre runs as its own service, separately from this website and in its own network segment - it is the only part of the project that takes input, and it is kept away from everything else for exactly that reason.
It is reached at konto.puppenspieler.net.
Once you have an account, the setup guide takes you to the welcome screen.
Not an offering by Microsoft or AOL. MSN, MSN Explorer and AOL are trademarks of their respective owners.