working with Coda markings

From the Index:
To have these marks work, you must follow a few guidelines:
♦ Segno, Coda, To Coda, and Fine don’t have any function unless you placed one of the four D.C./D.S. options in the file.
♦ D.C. al Fine requires a Fine mark in the file, or it won’t do anything. ♦ D.C. al Coda requires both Coda and To Coda in the file. ♦ D.S. al Fine requires both a Segno and Fine mark in the file. ♦ D.S. al Coda requires a Segno, a Coda, and a To Coda in the file.
First: How do I place D.C/D.S option in the file? Does this mean, on the page as a symbol.
What is a "fine" mark
Iv'e tried to make the Coda stuff work; meaning to play back. Im missing something obvious about the whole procedure.
Thanks
To have these marks work, you must follow a few guidelines:
♦ Segno, Coda, To Coda, and Fine don’t have any function unless you placed one of the four D.C./D.S. options in the file.
♦ D.C. al Fine requires a Fine mark in the file, or it won’t do anything. ♦ D.C. al Coda requires both Coda and To Coda in the file. ♦ D.S. al Fine requires both a Segno and Fine mark in the file. ♦ D.S. al Coda requires a Segno, a Coda, and a To Coda in the file.
First: How do I place D.C/D.S option in the file? Does this mean, on the page as a symbol.
What is a "fine" mark
Iv'e tried to make the Coda stuff work; meaning to play back. Im missing something obvious about the whole procedure.
Thanks