zomgzabadger posted... Can you put anyone in jail? IF SO HOW --- D:
Station them in a garrison of your castle and if you have a Jail it will put them in there when you garrison them into your castle. Basically it puts them in the prisoner section when you add them to the garrison.
I rarely make lords as prisoners and usually just set them free since it makes them like you more and easier to later make them your vassal.