very large text "To Coda" and "D.S. al Coda" above the staff, but not like "rit.", "dim.", etc

[Kenneth Wolcott]

Hi;

  I know how to engrave small directives (such as "rit.", "dim.", etc;
but I don't know how to create huge text directives like "To Coda" and
"D.S. al Coda".