PowerSchool forms are designed to work best with Google Chrome or Mozilla Firefox browsers. I suggest using either one of these to access the Enrollment form. Additionally, I recommend clearing the cache, browser history, and cookies of your internet browser and then trying to submit the form.
I have attached an article here that should walk you through the process of clearing the cache, browser history, and cookies of your browser.
If you are unable to submit the form after you have been through the following steps, I recommend reaching out to the Enrollment section of your school district who should be able to provide the correct link.