You need to know your spouses Net Income or enter an estimate: 

Your tax return now reflects multiple factors, such as income levels of each spouse and available credits and deductions. When you get married, both your incomes are combined to determine eligibility for certain benefits, such as the GST/HST credit.

I want to object, but TurboTaxBrenda's answer is not the source of my frustration. I was hoping for a way to file without having to wait for her. Guess CRA doesn't allow that, any more than they allow me to access My CRA account. Useless. Thank you for answering.

Thank you for your feedback,  we appreciate it. 

What I do is I ask my wife for her previous year Net Income. Input something higher in my Income tax as an estimate and then file.

When her taxes are ready and filed (usually a couple of months after) i ask her again the amount (or amounts but usually the Net Income only) and go online on the CRA site and correct the line where her amount is entered.

Call CRA they will guide you.