How do i merg models together???

^_^ I REALLY WANNA KNOW HOW TO MERG 2 MODELS TOGETHER ^_^

-LIKE A FOOTMAN RIDEING A DRAGON-
or
-A RIFLEMAN'S HEAD ON A MARINE-

PLZ HELP!!! THANX!!!

Do you have 3ds Max? If so, go here. If not, go here. (There's a geoset merging tutorial there, but you'll need to download some programs and learn their basics first.)