This is just the place to get the answers you're looking for, @Glycylmarketing.
To clarify, are you referring to closing a bank account, an account listed in the Chart of Accounts, the books for the fiscal year, or a QuickBooks Online subscription?
First, I'll show you how to close a bank account. Here's how:
Navigate to the Transactions or Banking tab in the left navigation bar and select the Banking tab.
Choose the account you'd like to remove. Select the small pencil icon in the top right corner of the blue box, and click Edit account info.
Place a check in the box beside Disconnect this account on save.