There is a process of posting bail and usually a set amount of time for you to post bail. In the case of less serious crimes, a suspect will pay a lesser bail and they can also usually get bailed out much sooner. In the case of lesser crimes a suspect may only need to wait just 48 hours in order to receive a bail hearing.
There are some jurisdictions that may take longer to set bail especially in cases where a person has a history of avoiding their past court appearances, they have a criminal record or they have committed a serious crime. Once the bail has been set, you can establish a way to handle bail payments.
As long as a person is incarcerated and involved in a trial but not convicted, you will be able to post bail.