Change how far in advance customers can book online.

Step One.
Navigate to the settings option, and select the 'Booking Form' wizard.

Step Two.
This setting is found on the 3rd tab 'Slots'.

Step Three.
Scroll down to 'Advanced Booking Cutoff' and enter the amount in days you want to allow customers to book in advance online in the box beneath.

Step Four.
Click Save at the bottom of the box.