You can not now register on fav20 and save your websites anywhere.
To login fast just enter the following url:
http://www.fav20.com/[your_user]
If you already used fav20, you can click the 
on the top right to copy all saved websites from cookies to your account. More features will be added soon. Report any bugs please.
Don’t forget you can test the users with http://www.fav20.com/demodemo , password: demo