Chickens using coop

They don't know that it's "home." You will need to place them inside for several nights in a row (close the pop door so they can't come back out). Turning a small light on inside the coop about 15-30 minutes before dark can help lure them inside. If you don't have electricity out there, just use a flashlight or one of those batter opporated stick-on lights. Turn it off after everyone is settled in.

 

Also, don't get discouraged if it takes awhile. Some bird brains are smaller than other. I played chicken wrangler for 10 nights before my girls got the idea.

 

I would just lock them in the coop day and night for about a week. That will also help them register where home is, and it will be less work for you.