I do not know how to add a redirect after the user hits submit. I do not know how to add a success message after it is sent, and I do not know how to force them to agree to the terms, or else they cant submit it....

Hello, I am pretty new to PHP, and I had gotten a friend to help me write a php form.

I have everything set how I need it to be, but I am missing a few important things.

Users can just hit submit, and a blank message will be sent. I also have an agreement checkbox, which users can ignore, as the message will send even if it is not checked. Lastly, I need the page to display a "success message" when they hit submit....