i dont know how to put games on emulator

This is my first time dealing with emulators and i need to know how do i get games it..... i have the Fusion emulator for sega

any help will be greatly apprieciated

You need roms to put in a rom folder.Usually they are in .zip format.
Don't ask where to get them read the RULES first.
After downloading a Sega Genesis rom go to load and select the .zip.You should be playing.