QB Issue Resolution:

You shouldn’t adjust prior years without talking to your accountant – it may require amending prior tax returns.

Try this – login w admin rights and set a new closing date.

Resolution for Issue 'How do I obtain the password to add a transaction to 2012?' available: Yes (Solved).
Source: Intuit Community forum.

How do I obtain the password to add a transaction to 2012?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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