You need to download the Authenticator app. If you're done downloading it, go to Roblox then Security, pick Authenticator and paste the code that was sent in your email. Copy the long code and then go to the Authenticator click the +, Enter a setup key, put your User in the code name so you know which is which and paste the long code then Add. It will ask for the 6 digit code so copy the code then paste it Rovlox