Trying to connect but French is onscreen language. How do I change it to English ? Thanks

itsitstom 

If you are in the initial phases of setting up your Roku device, press and hold the Reset button for 30+ seconds in order to factory reset.  Then select English when prompted.

If you have already set up your Roku device, then you need to navigate to Settings/System/Language (Paramètres/Système/Langue) and select English.