I have done my taxes and now trying to do my husband's. It won't allow me to do just his

When you started the return, did you choose to prepare only his return? Because if you have chosen to prepare the return for "My spouse/partner and me" then it will ask you all the questions for both of you. 

To change this, you would need to start a new return, and select either "Myself" or "Someone Else" when asked who you are preparing the return for.

To start a new return, select “Start a New Return” from under “My Returns” in the top left corner. Once you have started your new return, you can select “View All Returns” from under “My Accounts & Returns”. Then delete the unwanted return by clicking the small Trash Can next to it or “Delete” under the return’s name.