I’ll assume you don’t have your password memorized, meaning you have a decent password. But not all is lost.
Do you have the Steam app on your phone? You should, since that’s how they do 2-Factor authentication, which you very much should be using to secure your account.
Open the Steam app on your phone.
Touch the bottom right (the 3 bars).
Touch “Steam Guard”.
See the barcode-like square (QR code) on your deck’s screen? Move your phone’s camera over that.
It will verify on your app that you want to sign it in. Do so.
I’ll assume you don’t have your password memorized, meaning you have a decent password. But not all is lost.
Do you have the Steam app on your phone? You should, since that’s how they do 2-Factor authentication, which you very much should be using to secure your account.
Open the Steam app on your phone.
Touch the bottom right (the 3 bars).
Touch “Steam Guard”.
See the barcode-like square (QR code) on your deck’s screen? Move your phone’s camera over that.
It will verify on your app that you want to sign it in. Do so.