There are 3 ways to be placed into jail:
- Rolled doubles 3 times in a row
- Land on the 'Go to Jail' space
- Pick up a 'Go directly to jail' card from a community chest or chance card.
Once in jail you have 3 chances to roll a double to get out of jail before you have to pay 50 and are automatically out of jail.
You can if you need to quit out and reload whilst in jail if you screw up the roll.