Necessary Pico Commands
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To open a new file using pico, at the command prompt type

>pico filename

For example, if you want to create the file hello.c you will type

>pico hello.c

If you would like to open an existing file, use the same format, but
name an existing file. When you do this, your screen should contain
the existing file instead of being blank (for a new file).

In pico, you can simply use the arrow keys to navigate and you can type
normally. One problem you might have is word wrap. If a line of yours is
too long, you can pull it back to the previous line by putting your cursor
at the spot on the next line where the wrap has started and hitting 
backspace. If you then hit forward space followed by backspace again, then
the original spacing will be preserved.

When you want to see the line number you are on, hit Ctrl-C.
To go one page down, hit Ctrl-V.
To go one page up, hit Ctrl-Y.
To cut a line or hit Ctrl-K. If you do this repeatedly reasonably
quickly, you can cut a whole section of text.
To paste this section of text, hit Ctrl-U.

These directions always appear at the bottom of your screen.

Finally, to quit and save, hit Ctrl-X, then answer Y, then hit enter.