From your Flexbooker account, go to your "Settings" page, and scroll at the bottom part of the page, click and choose the "Booking Statuses" label:

This would lead you to another page, which allows you to add a new customized booking status:

You can edit the name of the status, description, background color and text color:

Make sure to click on the "Save All Statuses" button to save any changes.

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