You can update your own surname and title in the Member Zone. To do this:

Log into your Member Zone
Click the Profile icon with your name in the top right
Click My account
Under the Details section, click the chevron next to your name
Update your title and surname accordingly
Click Continue
Take a moment to check your changes and once you are happy click the check box next to 'I confirm these details are correct'
Click Change my name

Click the link below to update us other name and title changes on your plan.

Health plan personal details