[TYPO3] feuser_admin in 4.0.1?

[News]

I am in the process of setting up my first site in Typo3.
Because I need to setup an user registration, I installed 'feuser_admin' and 
created a test account. However I was not able to login with this account, 
therefore I also installed 'newloginbox' and set up a fine, new loginbox on the 
login page.
Even with this form I am not able to sign in.

Can anybody shed a light for me?
The only documentation I found uses the Bigfoot quickstart site which I don't 
have (does this site even work with 4.0.1?)

For the user registration I've setup a SysFolder directly under the root of the 
tree (on the same level as 'Home')

Thanks in advance for any directions,
Pascal