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Well you would have to be registered and have a password. Then you would go on the website, click on appointments and choose the one you want, then a list of available appointments would come up and you could choose one, then change your original one. This is how I imagine the outpatient contact centre would do it when you phone them and this is how it works with the GP appointments, but I don't know if it's possible to register to do this with hospital appointments.