The first thing to do is find out what kind of attachment mechanism your car has. It could have a hook slot connector or a straight-end connector. The DMV provides a handy step-by-step guide on how to unhook your old wiper arms and install the new ones.
To install the new wipers, in most cases, it boils down to sliding the new wiper arms into place until you hear a click. That sound means the new arm is attached in place, which means your job is done.