Thank you for your question. Click on forms view. (if you are in easy step click on the forms Icon in your blue tool bar)
Scroll to the bottom of your screen. Here, you will see three tabs, your name, forms and T-slips.
Click on the T-slip tab.
From the left side of the window, under federal click on the T-slip you wish to modify or edit.
Each column represents a slip entered, to delete a slip, clear a column.
Save and close.
I hope this helps.