Step 1 download roblox
Step 2 log in or sign in to roblox account
Step 3 click on the game you want to play
Step 4 click on the green play button
Step 5 click on download roblox
Step 5 then it will come run it or cancel you have to click on run it
Step 5 then you wait until it install
Step then again click on green button
Now you will join to your game
enjoy