If have created your entries through the Automatic Entries tab in the General Ledger Module, this will create unposted journal entries.  If you refrain from posting them directly as part of the automatic entries routine, you can access them in the General Ledger Module, Journal Entry tab. To change them:
  1. Double-click on the entry
  2. Make the necessary changes
  3. Save. 

Once you're finished making changes, run an edit report, confirm correctness and post.