Assuming you're talking about a drip machine then i'm afraid its physically impossible.
Espresso by definition is not brewed, its extracted under pressure.
Expresso is generated by subjecting finely ground coffee to approx 9 BAR(9 x the normal atmospheric pressure) of pressure. It takes around 25 seconds to produce approx 2oz of espresso. A drip brewer just dribbles water onto coffee which soaks through the coffee and gets imparted with some coffee oils and flavours.
You can do it, but you really can't call it espresso. It’s more of a dark coffee with some highlights of espresso. I have had clients do it when there machine breaks and they are only interested in making frappes. It is only done to help with the loss of profit for that day.
I bought a can of pre-grind espresso beans that claimed, 'for use in coffee makers AND epresso machines.' I'm a little slow and new to the whole world of coffee, doesn't the above imply two types of machines maybe used?
You can't make espresso from a 'regular' coffee maker, however, you can make regular coffee using 'espresso' coffee, I do it all the time. I like certain Italian Espresso coffee blends and roasts that I use to brew in a drip or french press coffee maker. It makes great coffee, reminds me of espresso made with the same beans but is still brewed coffee.