The primary means of accessing, managing or deleting your Personal Data is through the Privacy Dashboard, as described in section 6 of this Policy. Customers may also delete their Steam Account and associated Personal Data as described in section 6.3 of this Privacy Policy. If you are unable to access or delete data through the Privacy Dashboard, you can also contact us with a request to exercise these rights by using the form found at https://help.steampowered.com/en/wizard/HelpAccountDataQuestion. To verify your identity, you will need to log in with your Steam User Account to use the form. Finally, you can contact us with a request at questions@valvesoftware.com, however, before providing access to, or deleting any, Personal Data, based on a request received via email, we will need to verify your identity utilizing the "Proof of Ownership" process described at https://support.steampowered.com/kb_article.php?ref=2268-EAFZ-9762.
Do I have the right to access my data? 
If you are unable to access or delete data through the Privacy Dashboard, you can also contact us with a request to exercise these rights by using the form found at https://help.steampowered.com/en/wizard/HelpAccountDataQuestion