How do I see what changes have been made to a time entry?

You can view a log of all modifications that have been made to a time entry from the View Time Detail screen.

First, double check that the "Modifications" column is visible in the report grid by selecting it from the column selector dropdown:

Next, click on the star (*) next to any record that has modifications to see a list of changes that were made to that record and by whom. Records that have not been modified will not have a star.