Page not appearing as yours

Hi Harry,
Please refer to the style integration guide: http://designwall.com/guide/dw-question-answer-plugin/#Style_integration
You would be able to fix the problem by implementing your theme’s wrapper style.
Also if you are referring to the sidebars appearing at the bottom of the DWQA section, please do the following:
To get the Q&A on one page without sidebar, you can add the following code to the style.css file:

/* In question list page*/
.list-dwqa-question #sidebar {
     display:none;
}

/* Single question page */
.single-dwqa-question #sidebar {
     display: none;
}

/* Submit question page */
.submit-dwqa-question #sidebar {
     display: none;
}

do I need to change ‘dw-simplex’ to dw-mytheme into content-start wrapper

Hi I did changes on active theme, while page.php is in child theme.
But still not working, this shows various pages below the form. Pls chk below:

should I change my page title on line 

  <h1 class="page-title"><?php _e( 'Question & Answer', 'dw-simplex' ); ?></h1>

Hi Harry ! 
We can not check your link, please tell me if you have resolved this issue or not.