1. Before you can enable Family Library Sharing, you must first have the Steam Guard security feature enabled. This can be done by opening the Steam settings menu, clicking on the Account tab, and selecting the “Manage my account with Steam Guard security” option.
2. To enable the sharing feature, you must first log in to your family member or friend’s computer with your Steam account. Next, open the settings menu, click on the Family tab, and choose to authorize the computer. You will then have the option to authorize any accounts that have also logged into the same computer.
3. Once this is complete, log out of your account and let your friend or family member log back into theirs. They will then have the ability to download and install select games from your gaming library.
4. You can authorize up to 10 computers and up to five accounts to access your Steam gaming library.