How can I make radio buttons bigger?

Bigger Radio Buttons can be achieved by injecting the neccesary CSS code to your form.

For example I have cloned your form and injected the code:

.form-radio{
width:50px !important;
height:50px!important;
}

Example Form: http://form.jotformpro.com/form/40718865480967?

All you need to do is customize the value 50px to a higer or lower value you wish to use.

This is where I injected the code:
Go to Setup & Embed | Preferences | Form Styles | Inject Custom CSS 

Do let us know if you need further assistance. Thank you.

Related Article:

How-to-Inject-Custom-CSS-Codes

hi to change the style of radio button

@sanaullahrais

Please open a new thread for that question so we can assist you within your thread without taking this thread.

Thank you!