If you didn’t sync your steps during the onboarding process, you can do so now by going to your profile and then “integrations”. You can then sync through there.
You can also track your steps manually by visiting this article.
Note that there may be a delay in your steps syncing. If they are still not synced after a full day of setting up the integration, please reach out to our team at support@builtwithscience.com or utilize the in-app chat service.