When you’re collaborating on a workbook, it’s important to be able to see what kinds of changes others who are working on it are making, too. You can use Excel 2013’s Track Changes feature to easily identify additions and changes made by others who are sharing your workbook.
Click the Review tab.
Click Track Changes.
Click Highlight Changes.
The Highlight Changes dialog box opens.
Select the Track Changes While Editing check box.
Click OK twice to save and share the workbook.