Type chfn in the shell command prompt.
Step by step it will ask you your Name, Location, Office Phone, Home phone etc. If you want to change a field enter
information there, otherwise just press 'Enter'.
When someone fingers you using the 'finger' command,
(egs: finger dave@somewhere.com ) he will see the information you entered using the chfn command.
if you create a file called ".plan" in your $HOME
then the contents of that file will be printed when someone
"fingers" you.