Remove the aerator at the end of the spout. It will unscrew and once off it will have a dime sized restricter in it that can be removed this restrict's the water down to about 1.6 gpm to save water.
It will either be plastic or metal and about the size of a dime with a small holw in it to let water pass by maybe 1/8" hole just remove it and put aerator back together.

Clean aerator screen out before you put it back together.

http://www.plumbersurplus.com/pdf/07163.pdf This link has a breakdown of parts. Look at parts 8b-10 for aerator breakdown.