I can't play wormnet how to register?

You don't need to register.
Enter any username and password you like.

you dont need to register, any username password combo will work for both WA or WWP.

you dont need to register, any username password combo will work for bith WA or WWP.Except in WWP, you can't use a null string ("") as a password.

lol at me and bonz posting at the same time :D (and my awefull typing...)