What does "convert outlines to text" mean?
The reason why you would need to convert outlines to text is because even though most printers have an extensive font library, there is no guarentee that they will have that specific font, or that your chosen font will look the same on the printer's computer.
That's why in the Adobe Creative Suite, old Freehand versions and Coral Draw you have an option to convert the text to outlines, which means they become a line drawing instead of a font, taking away any need to provide the actual font.
To find this option in the program, it will usually be under the "Object" or "Text" menu on the upper menu bar.

If you are using a program such as Quark, which doesn't have this option, look for an "Embed Font" option when saving the document.