To link your Steam account to Google or mail (in addition, it is possible to link your account to other platforms and services), in order to be able to log in through the mobile application on your smartphone, you must follow the link: https://account.hybeim.com/en/common/signin?redirect=%2Fen%2Fmy-account and selecting the appropriate icon or field for your email to complete the link. I also advise you to take advantage of the opportunity to set a password for your account.