You may want to change your contact details or address that will show on your emails, invoices and other templates; you will need to check your details in 2 places.
Go to the control panel > personalise > check your details there.
You should also check your details in the Branches section.
Go to the control panel > branches > press the pencil symbol next to your branch > check your details there.
After you have updated all your details scroll down to the bottom and press Save.