Maya 8.5 to Egg Help

Hi I’m sorry if theres another post out there like this but i didn’t find one.

So i have my model and i want to export it as an egg so I look at the manual and it says to flag the object and to me the instructions are just foggy. So i follow the instructions and it doesn’t create the attribute so when I export it it comes up as nothing because its not flagged.

If someone could give me a link or better explain it to me I would appreciate it very much.