Rearrange my Smart Meter Installation

I have booked a smart meter installation.

I’d like to change the appointment for another day. Does anyone know how I do this?

Help states:

"Yes.

You can cancel your appointment in your [Bulb account](https://account.bulb.co.uk/dashboard/smart/cancel), up to 1 working day before the engineer is due, at no cost.

A working day is Monday to Friday, excluding public holidays.

If you cancel less than 1 working day before the appointment, we’ll charge you a £30 cancellation fee. This will be taken from your Bulb Account."

But this link (https://account.bulb.co.uk/dashboard/smart/cancel) just redirects to the dashboard from where there is no option to change or amend the appointment.

Very confused??