Reply To: from where i change title and content that will show same in all products ?

Hello,

This is one of the Global Additional Tabs defined on your Site which you can find under the Theme Settings > Single Product > Tabs: https://snipboard.io/egQMkh.jpg

There you can change its Title and the content of it is appearing through the HTML Block so you can edit the HTML Block to change the content of it.

Best Regards.