To link your Steam account and claim a free pack follow these easy steps.
1: Register an account on the website. Make sure to use a valid e-mail address, as you'll need to confirm your registration before it can be activated.
2: Once you completed the Tutorial click the Login button in the Main menu.
3: Enter your login details you used when registering your account on the website. Make sure to untick the "Steam Auth" checkbox before pressing Login.
4: Visit the Profile page and exchange your free package to the one of your liking!