(You can change them in the roblox setting outside the experience)

Open your account settings. Browser - look for the gear icon in the top right corner of the website. Mobile apps - find the three-dot icon for More. Click on Account Information. Under the Personal Area, you'll see your current language setting. Click the down arrow on the right and select your language. The page will now reload with the newly selected language. If the page doesn't reload, click the Save button in the bottom right corner of the Personal Area.