How to fix secure cookie parameter - finding of pen test

2 These cookies are used on the encrypted (HTTPS) part of the website. Because they are not marked as Secure, these cookies will also be sent through unencrypted connections to the server. 3.When cookies are transmitted over an unencrypted connection, and an attacker is able to place himself between a victim's browser and the web server, the attacker will be able to intercept the contents of the cookies. 4.Supply the cookie parameter Secure when setting a cookie intended for the part of the application where encryption is used.

How to fix this finding ?