I am a web developer at Roblox. Ask me any question and I will try my best get back to you :)
Check Remember my choice and click in the dialog box above to join games faster in the future!
Click RobloxPlayer.exe to run the Roblox installer, which just downloaded via your web browser.
Click Run when prompted by your computer to begin the installation process.
Click Ok once you've successfully installed Roblox.
After installation, click Play below to join the action!