If pico is not installed, login to your server via SSH as root and execute the below commads :
1. wget ftp://rpmfind.net/linux/redhat/9/en/os/i386/RedHat/RPMS/pine-4.44-18.i386.rpm
2. rpm -ivh pine-4.44-18.i386.rpm
Pico will be installed on your server. You can then edit a file using pico editor as :-
pico filename
You can save it by pressing Ctrl X and press Y and Enter key.