How do I add another guest to an excisting reservation?

When a booking has been created, yet another guest needs to be added afterwards, it only takes a few steps to amend the booking.

In the booking page of the reservation go to the "Allocation section" and hit the More button: 

Here you click on the pencil button (which means you can edit):

Now you click on the Pax button which is still grey:

Add all guests details and hit Save:

Although the Pax button is still grey, hit Save Changes in order to save the added extra guest:

You have now Successfully added another guest to the reservation: