Liferay web content display different data per user

I am new in liferay. Using Liferay 6.2. I have made a custom page template (D_template) and all users with user group D takes page template D_template by default. In this page template I have added Web Content Display portlet with custom structure and custom template.

My problem is when a user add data in this web content portlet then all other users see same data in theirs pages.

I need to change this and every user see theirs data.

How can do that? Can anyone help me?

Thank you