how to chnage position of ask question button

To resolve this issue, you can add the following code to the style.css file:

.dwqa-ask-question a {
float: right;
border: 1px solid #ddd;
padding: 4px;
}
.dwqa-ask-question {
margin-bottom: 70px;
}

Then Go to your theme folder (wp-content/themes/[theme-name]), and create a new folder, named it “dwqa-templates”. Inside your new folder, create a new file: “archive-question.php”. and add the following code to this file:

<?php
/**
 * The template for displaying question archive pages
 *
 * @package DW Question & Answer
 * @since DW Question & Answer 1.4.3
 */
?>
<div class="dwqa-questions-archive">
 <?php do_action( 'dwqa_before_questions_archive' ) ?>
 <?php if ( dwqa_current_user_can( 'post_question' ) ) : ?>
 <div class="dwqa-ask-question"><a href="<?php echo dwqa_get_ask_link(); ?>"><?php _e( 'Ask Question', 'dwqa' ); ?></a></div>
 <?php endif; ?>
 <div class="dwqa-questions-list">
 <?php do_action( 'dwqa_before_questions_list' ) ?>
 <?php if ( dwqa_has_question() ) : ?>
 <?php while ( dwqa_has_question() ) : dwqa_the_question(); ?>
 <?php if ( get_post_status() == 'publish' || ( get_post_status() == 'private' && dwqa_current_user_can( 'edit_question', get_the_ID() ) ) ) : ?>
 <?php dwqa_load_template( 'content', 'question' ) ?>
 <?php endif; ?>
 <?php endwhile; ?>
 <?php else : ?>
 <?php dwqa_load_template( 'content', 'none' ) ?>
 <?php endif; ?>
 <?php do_action( 'dwqa_after_questions_list' ) ?>
 </div>
 <div class="dwqa-questions-footer">
 <?php dwqa_question_paginate_link() ?>
 </div>
 <?php do_action( 'dwqa_after_questions_archive' ); ?>
</div>