why login&pass for "Through this code snippet, you can access the form without login" ?

why login&pass for "Through this code snippet, you can access the form without login" ?

hi 

i just made snippet on my paid account and put it on site

snippet code

"<iframe height='341px' width='100%' name='zoho-form' frameborder='0' allowTransparency='true' scrolling='auto' src='https://creator.zoho.com/vsavonkin/rabotanaem/form-embed/form/tC2rp1HCeEn1tTUDxew9P2sd3EVDahaqmOSEq1H3CgzHbJ6Ea3QfqDaCw1M1vmF4fqqARm8DmgsVYSxeyBa3CaT27bEMWJ9Nqh6t/zc_BtnFontSize=18&zc_BtnBgClr=red&zc_BtnClr=white&zc_BgClr=lime&zc_SuccMsg=Мы получили вашу заявку и уже ее обрабатываем!'></iframe>"

why in browser form asks me for login&password?