If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
At the police station the cops are always in a rush and this is why the parking place is a mess. You will have to park your cop car trying not to hit any other car in the way, and be precises, park on the marked spot! Time is short, and your score depends on it. Colliding with other vehicles or objects in the parking lot will result the loss of the cars health.