How to remove form warnings.

- how to cancel this message at the bottom of the form  "There are errors on the form. Please fix them before continuing and the red outlined boxes,and instead to inject a code that allows to change the background of the box to a light color when information is missing?

In order to remove that error message, you need to go to your form warnings settings: https://www.jotform.com/help/61-How-to-Change-Form-Warnings 

And simply delete that message:

And if you need to change the color of the red background on error messages:

You can do it through CSS customization as shown on this guide: https://www.jotform.com/help/75-Customize-Your-Form-Using-Custom-CSS-Codes 

Lets say you want to set the background transparent, you can try this code: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes 

.form-line-error {background:transparent;}

Or, if you want to set a different color, try this .form-line-error {background:"your color here";}, example:

.form-line-error {background:blue;}

Let us know if you need more help.