If you are on police bail with conditions (i.e. you were given the bail conditions at a police station) and have not yet appeared at court, you must return to the police station where you were bailed and ask the Custody Officer if they are willing to alter your conditions. Alternatively, you may wish to contact your solicitor, to make representations on your behalf.
If the court has given you bail conditions, it is the court who have the power to alter the conditions. The police cannot alter bail conditions given at court. You will need to get in touch with a solicitor who will make an application to the court to vary your conditions.
You will need to explain what conditions you require amending and what changes are requested.
Please note that in both situations your request will not automatically be granted, the court and the custody officer will consider the application before making a decision on whether or not to amend the conditions.