Yes. You can change that information. These field will be coloured gray, and you will not be able to update them. (A red circle with a diagonal line will also appear when you mouse over the field.) This is because the information was brought forward from the first tool (Come to Canada) you completed. To update them, you will have to update them in the previous step. To do this:
From the “Express Entry Profile” page:
Click on the “Modify Family Information” button at the top of the page
Change the fields as needed.
Click the “Update Information” button to save any changes