1) how to edit files such as httpd.conf using pico command

pico httpd.conf

i'm getting cpmmands at the end of page where i do not know how to use. like how to exit, how to copy and how to paste

2) how to make ssi work in html pages as well as shtml pages


3) how to make cgi scripts work outside cgi-bin directory

4) how to redirect pages not found (404) to a file you made


thanks for your help