few pointers, at the command prompt type; man vi
This is going to bring up the manual for vi. You can read this. Any time you want to quit vi press q for quit. If you want to find out where your how to's are located, try the find command.
At your prompt type; find /etc -name how* -print
I know this may look a little confusing but what you are telling Linux here is to find under /etc the -name how* (the wild card, asterisk is to match any following carachters) and -print the path where you can find it. I hope this helps. Let me know.