Yes, use less than a regular machine. Buy soap the has the HE logo on it. When you look inside the cap, you will see a line close to the bottom of the cap. That is the amount you use. It is maybe a 1/4 inch of soap. If you overuse soap, your machine will smell moldy/musty.
If you have a water softener, you use about a third of the amount you would use for HE. (high efficiency)
Hope this helps!