If you're using void a check in quickbooks online to manage your accounts, you may have needed to know how to void a check in QuickBooks. Choose the bank account from which the original check was issued, and select "View Register." Find the check you need to void, click on it to highlight it, then click "Edit." At the bottom in the center, click "More," and select "Void." You will be asked to confirm your decision to void this check.