Once bail has been set, the defendant or a third party can post the bail to secure the defendant's release from custody. If the defendant cannot afford to post bail, they may seek the assistance of a bail bondsman.
You can withdrawl your agreement by calling the bondsman and telling them that you no longer want to be on the bond as you feel the ``criminal'' will not show up to court. You can sign off of the bail but they may arrest your friend.
No - if you signed the bond it doesn't matter whether you have a job or not - or whether the bondsman asked you if you did. You are liable as surety on the bond - having a job or not has nothing to do with your liability. Sorry.