From Pine's [M]AIN MENU, choose [S]etup, then [C]onfig. Move down to the customized-hdrs option. Press A:Add Value. Use the format:

        From: "My Real Name" 

Note: You may wish to configure default-composer-hdrs so you can easily change the From: line when composing new messages. The process is the same as adding to the customized-hdrs entry. If you use this setting, remember that you must specify all the headers you want to see; simply changing the value to From: will make From: your only visible header.

Press Return to accept the change, and E:Exit Setup.

Note: Changing the From: line may not give you the complete anonymity you desire. Savvy computer users may know to look in the message headers for the Sender: or X-Sender: lines. These may still include your entire email address (even the name of the host you were logged into).