Self-Employment and employment expenses are two different things.
The income from your T4A is being transferred to the T2125 form for self-employed income and expenses. You have to access the form and fill the rest of the information.
To claim employment expenses your employer must provide you with a T2200 filled and signed. You can then enter your employment expenses on the T777 Statement of Employment Expenses form.
If you have two Self-Employed business you must fill a second T2125 form for your second S-E Business.
