Here's the trick to appear Offline on Roblox on your Windows PC or Mobile Phone and prevent users from communicating with you.

Head over to the Roblox website and create an account for yourself. Then all you need to do is click on the 'Avatar' tab on the left side of the screen, where you’ll see your avatar ready to go.

If Roblox is not opening or working correctly on your PC, it could be due to an ongoing server issue that is preventing you from launching the app correctly. So, make sure Roblox servers are not down.

Click the green play button, and a popup will appear. Click "Download and Install Roblox." Once the download has been completed, open the downloaded file if the computer does not do it automatically.