Thanks for keeping your account information updated! Simply click the Profile Icon in the top right of your account and select My Account. In the My Profile section, you'll see the different links for updating/changing your account information. You may also need to edit the payment method for your account, and opt in/out of payment receipt emails:
In addition, you can click the Profile Icon in the top right of your account and select My Settings to edit signature info:
I hope this helps!