Can I get people who goes to my form pay their registration?

we are non profit baseball park

That should be possible adding payment tools in your form. You can do that by following this guide: http://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form. Here's the list of 3rd party payment processors that we support in our form builder: http://www.jotform.com/help/323-Mastering-Payment-Form-Integrations-with-JotForm 

Let us know if you need more information on this.