Journal entries may be created at any point in Audit Assistant, and theses are accumulated on the Adjustments page (usually W1).
Editing or delete a journal must be done from the page where it was created. In this case we have an adjustment that was created on page C1:
(If the journal has been posted, first delete the "posted by" message to move back to pending)
To edit or delete the entry, follow the hyperlink back to C1:
Select the edit icon to the left of the link (if this is not visible the page has probably been concluded - so will need to be unconcluded first):
Now either edit and save or delete from the button at the bottom right.