newbie question

[tom]

hi, this may be a really basic question but i could really do with some pointers - i am very new to red hat... i have looked around for a solution but have had no luck. when i set up redhat 8 during the installation 'security config' window i ask for www, ftp, dhcp and mail to be classed as trusted, and i tick the custom level box. after installation is complet the security levels are defaulted back to 'high' - the Ethernet card (eth0) is not trusted as are non of the protocols - so i select the settings i want (trust eth0 and www, for a start) and close the window... when i reopen the window the settings have been reset to 'high' level - how can i stop this from happening? is it necessary for my Ethernet card to be trusted to get onto the net, i am presuming it does as i cant connect at the moment thanks in advance for any pointers/help tom   ** sorry if this was sent twice! **