Locate the job you want to reschedule in either the Schedule section or Jobs section of your Zenbooker admin.

In the job's Date & Time section, click the Reschedule button.
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Select the new date and time you'd like to reschedule the job for. If the Available Times mode is highlighted, your availability rules and settings that apply when normally scheduling jobs will also apply when rescheduling.

You can have Zenbooker notify the customer of the new appointment time by checking Notify [Customer Name] via email.

Tap the job you want to reschedule, then tap on the ⋮ icon in top right corner of the screen. This will open a sheet of job related actions at the bottom of the screen. Tap on Reschedule to launch the reschedule popup.