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Hi there, @launmolly.
You can enter a new password in the Account and Settings, so you can add older transactions to your account. Let me guide you how:
After that, you can refer to the following articles for options to track older transactions, as well as some resources you can use when reconciling and preparing your business for the end of the year:
Reconcile Workflow in QuickBooks
If you have more questions, just drop a comment below. I'll be happy to help you out. Have a great day ahead.