1. Click the Change the posting period icon (Ctrl + M) on the Toolbar.
2. Double-click the accounting period to which you want to post the transaction.
3. Click Yes to the message, "You have chosen a period that isn’t the current default. Are you sure you want this period?"
4. Click File, Save.

 NOTE: The posting period you selected will remain open until you close the window, allowing you to post consecutive transactions to that period.