To put Roblox in dark mode, sign into your Roblox account on the website or mobile app. Access the settings by clicking the gear icon on the website or tapping the three dots on the mobile app. Navigate to the theme settings by scrolling to the “Theme” section on the website or tapping “Settings” and then “Account Info” on the mobile app. Select dark mode by clicking the dropdown arrow next to “Theme” on the website or tapping the text box below “Theme” on the mobile app and choosing “Dark.” Save your changes by clicking “Save” on the website or tapping “Save” on the mobile app. Your Roblox account should now be in dark mode. To switch back to light mode, repeat the steps and select “Light” instead.