In order to modify how your site detects languages, you will need to click on “Configuration” (highlighted in purple in the below screenshot) and then find the “Languages” link underneath “Regional and Language” (highlighted in red).
Clicking on this link will bring up the languages page. From here, you have several options depending on what you need to manage. To modify the canonical URL settings, click on the “edit” button next to the language you wish to modify (highlighted in orange below) and refer to Managing the canonical settings for a language. To modify what methods are used for detecting the language, click the “Detection and selection” tab (highlighted in blue) and refer to section Managing the detection and selection settings. To add additional canonical paths or domains to the accepted list, click on the “Multi-site locale” (highlighted in green) and refer to section Managing additional MSL components.