First of all, you need to build a few units by clicking on them in the Pre-battle screen.

Frog Batting

Way Of The Stick
Then press Play to enter the frontline. From there, you can click on the units it the toolbar to deploy them into battle. Plan your strategies carefully, and dont forget about the upgrades.
Use your MOUSE

Longest Yard Game Hit "Z" nad "X" KEYS repeatedly as quickly as possible to gain more speed. Then press SPACEBAR to release your kick. Watch the angle of your kick.