User settings for internet access

[Kali]

hello all !
As root, i have set permissions for user2 and user3 to access the
internet.  However, when they enter the data (logid and password) the
form does not allow transfer of this data and  users are not able to
access the internet.
So I tried as ROOT and it works but user2/3 are still unable to go
online. I used GUI to set permissions.  Why are the setting not
permanent ? What am i doing wrong ? Is it better to use CLI and if so
where can i find more info ?
Thanks for your time.
-- 
Kali