Overview
There's a reason reconciliations aren't normally undone. A reconciliation should be the final sign-off of an account, confirming that these transactions match an actual bank transaction. Changing the transaction after the fact would make the reconciliation no longer valid. Reconciliation shouldn't be completed with incorrect information, so DoorLoop doesn't allow changing reconciled transactions after the fact, since this would break your financial records.
This is why you can't edit a transaction that's already been reconciled. You also can't edit the opening balance or the accounting start date on a bank account that has reconciliations on it. To edit any of this, you'll need to undo all your reconciliations up to the point where the transaction you want to edit is located. To edit the opening balance, you'll need to undo all reconciliations on the bank account.
The Steps
To undo a reconciliation, click Accounting > Transactions on the main menu.
On the Transactions page, click the Reconciliation tab.
Find the reconciliation you want to undo, and starting from the most recent reconciliation for the account, work your way back to the oldest. Click the 3-dots next to the reconciliation you want to undo and select Undo Reconciliation.
Repeat the above steps to undo all the other reconciliations until you reach the point where you need to edit, or all of them if you're trying to edit your opening balance and accounting start date.
Important: Always undo reconciliations in order, starting with the newest and working backward to the oldest. Undoing them out of order can cause errors in your account.
Once you make your edits, you can then go back and complete the reconciliation again for your bank account.