How do you install a floating hardwood floor that snaps together?

I was given some hardwood floors with the padding already underneath and I'm trying to figure out what is the easiest way to install them. The look like they snap together but I'm not sure. So far what I've read online is that you have to glue them in place once they snap??? I've tried snapping them in place and all it does is moves or the planks don't go together. Suggestions?