The Pico text editor can be invoked by the following command:
pico [ filename ]
You will then be taken to the default Pico screen. Simple navigation is done via the arrow keys and keyboard shortcuts. All functions related to the modification and saving of files in Pico is also done via keyboard shortcuts.
The following functions are available in Pico via Pico shortcuts:
^G (F1) - Display this help text.
^X (F2) - Exit Pico, saving buffer.
^O (F3) - Output the current buffer to a file, saving it.
^J (F4) - Format (justify) the current paragraph.
^R (F5) - Insert an external file at the current cursor position.
^W (F6) - Search for (where is) text, neglecting case.
^Y (F7) - move backward a page of text.
^V (F8) - move forward a page of text.
^K (F9) - Cut selected text.
^U (F10) - Uncut (paste) last cut text inserting it at the current cursor position.
^C (F11) - Report current cursor position
^T (F12) - To invoke the spelling checker
^F - move Forward a character.
^P - move to the Previous line.
^A - move to the beginning of the current line.
^L - Refresh the display.
^D - Delete the character at the cursor position.
^D - Delete the character at the cursor position.
^I - Insert a tab at the current cursor position.
^B - move Backward a character.
^N - move to the Next line.
^E - move to the End of the current line.
For more commands and further information on Pine / Pico feel free to visit the University of Washington website.