php – Submit button in form tag does not work at all

I'm trying to solve a task for a selection process and it requires a registration form that I've created using a partially generated code from the ### ### ###############################################>>>>>>>>>>>>>>>>>>>>>>>>>>> 39 application mobirise because my knowledge in frontend development are zero. Now, when I've edited the html file for the required fields, the submit button just does not work.

first name

Last name

E-mail

Phone

Birth date

State

District

City

Pin code

Photo