Use the credentials you received (directly or via an external website) and log into the account. Make sure that the content on the account is correct (correct edition of the game, no playtime etc) Change the credentials to make the account your own: Change the email Change the password Add 2FA (Steam Guard) Please note that it may not be possible to add the purchased account to an existing Steam Family and to enable Family Sharing. The account should be used as a way of accessing the game/content you are interested in. It is not recommended to use it as your main account, as you might have issues with making purchases on it. Applying any changes to the purchased account, such as adding a payment method or changing the region, may result in the account being banned. In such cases, no refund is applicable.