You will find your employment expense section on the left side of the screen under the "Income" tab, then "Employment Expenses". Anything you have entered will be detailed in that section, click on the "edit" on the summary of your expenses and you will see what you have entered.
Please note that you will not be able to REFILE your return until you receive your Notice of Assessment from the CRA.
The following link will explain it in more details:
