Check your compost after a week. It should feel warm. If its not cooking yet, try mixing in some browns and greens . In the gardening world, browns are considered dead material like dead dry leaves, shredded dead twigs. Anything that crackles is a brown .
Greens are anything that is fresh and green.
Fresh grass clippings are great because they are extremely active. Mixing the browns with the greens is an effective way to get that compost to cook. If after a week your compost still hasn t generated any heat, then try adding nitrogen. This is incredibly easy, its simple household ammonia, one cup to a gallon of water. Pour the solution into the compost, and it WILL cook.