To get to an old journal entry:

You can open Journal Entry form (create + sign > other > Journal Entry) > upper left corner, click 'clock' icon for recent journal entries and click 'more' if need to expand the list of old journals. See screenshot.

You can also print QBO built-in 'Journal' report. Click Customize button and sort transaction type by the journal entry and run the report. 

For screenshots:

https://community.intuit.com/questions/1386433-how-do-i-get-to-an-old-journal-entry