Your income tax return is not NETFILED so you are still able to make changes. Click on the Income tab and click on Tslips and scroll down to T5007 and select it. You can also click on Find and type in T5007 and you will be prompted to enter the necessary information.
You can also click on Find and enter Disability amount and you will be able to enter the details.
The initial refund of $154.00 is the Working Income Tax Benefit being calculated for you.