You've come to the right place for help. I'd be glad to give you a hand with changing the language to French.
To change it, follow the steps below:
Let me know how you make out after trying the steps above. I'll be on standby. :)
Thanks for your interest QuickBooks Self-Employed in French. I'll explain why you're not seeing the option to switch the language.
At this time, QuickBooks Self-Employed is available in English. It's important to Intuit to be able to offer our programs in both of Canada's official languages when possible and our product developers know that our French-speaking customers would like to see the program in their preferred language.
I'll share your desire to have the program in French with my team so that it's something we can continue to explore.
Please let me know if you have further questions!