Steam program installation and login authentication can be done as the following steps:

[How to install Steam]

1. After signing up for Steam, click the 'Install Steam' button at the top of the screen

2. Click the 'Install Steam Now' button

3. After downloading the installation file, click the [Next] button to proceed with the installation process

4. When installation is complete, enter the Steam ID and password you created earlier and log in accordingly.

(※ If it is the first time you log in to Steam, you must verify that your email address is correct.)

[Steam Login Authentication]

1. When the message 'Is this the email address you are currently using?' appears, click 'Yes'

2. Access the email account where the verification email was sent to and click the email verification confirmation link.

3. Return to Steam and click 'Finish' button to complete the Steam authentication process.