If the defendant fulfills their obligation to appear in court, the bail bond company recovers the full amount of the bond. Conversely, if the defendant fails to appear, the bail bond company loses this amount, and the defendant may be liable for the financial loss incurred by the bond company.
If a defendant cannot afford bail, then at the arraignment or any hearing while still incarcerated the defendant can request a bail reduction or release without bail. That must be supported with evidence that the defendant is unlikely to reoffend or to flee.
You'll need to check in with your bail bond agency to check that you meet certain criteria to revoke your signature. After you have done that, your agency will advise you on the required paperwork through their contract management software and what evidence you need to give in order to be released from your agreement.