To create a Sport.com account, click on the register button in the top right corner of the main page. Follow the steps and fill in the registration form, then validate your phone number and email address. To validate your registration you have the option to verify your phone number and email address. Just click on the "Verification" button in the left corner of the page. You have the options "Send code by SMS" / "Send code by e-mail" for which you will receive validation codes both by SMS and e-mail.
After entering each validation code, the only step is just to press the "Verify" button in the By SMS and by E-mail section, and your account will be validated instantly. There is also the option to validate your account later.