Hello Ljc2,
Are you using QuickBooks Online or QuickBooks Desktop or QuickBooks Online Mobile App?
The Accounting section is found in the left navigation tab in QuickBooks Online. Please see the image below.

For QuickBooks Desktop, please click on the List menu and select Chart of Accounts.

For QBO Mobile App, there's currently no option to add an account. You'll have to do it using by logging your QBO account using a web browser.
Let us know if you have more questions. Thanks!