How can I create a form to record my daily steps?

That seems to be a simple form. Do you have any additional requirement in the form? 

Please check our form template gallery for similar forms that you can start with;

https://www.jotform.com/form-templates/?classic

https://www.jotform.com/form-templates/?cards

The below guide will also help you create your first form with Jotform;

https://www.jotform.com/help/2-How-to-Create-Your-First-Web-Form