For our website The the security field is blank, what change want to make for making security as "secure" , want to make it secure for cookies and requests.

For our website The the security field is blank, what change want to make for making security as "secure" , want to make it secure for cookies and requests.

This answer may give you an idea of the meaning of the secure flag in a cookie: How does cookie "Secure" flag work?
In order to be able to flag the cookie as secure, you must implement a secure connection first. In short terms, you should switch to serve your website using HTTPS.