On the Settings page in your account, there are several fields that are important to update with your business details:
Business Name - this will appear on email receipts.
Address - this will appear on email receipts.
Default Merchant - this sets the default merchant so that you don't have to select it every time you create a new payment page.
Language - This value is not currently used but may be used in future updates. Default is English.
Logo - this will appear on email receipts.
Country Whitelist - by default all visitors can access your payment page, but you can choose to only allow traffic from specific countries if you prefer.
Please visit these related guides for more details about how to: