Why can't I add expenses for self employment on my amended tax return? When I click the "Add expenses for this work button" it doesn't do anything?

It depends on the version of Turbo Tax you are using. If you are using Turbo Tax Online, you must use the premium Version.  if using the software, you will need a Turbo Tax Home and Business.

If you are using the correct product, you may need to clear your cache and cookies in your browser to activate the work button.