Widget: DW Focus: News Slider

Hi Daniel Albrecht,
To resolve this issue please follow my instruction here:
1. Open file dw-focus-slider.php in your site / wp-content / themes / your theme / inc / widgets/ dw-focus-slider.php
2. Replace bellow code – line 46

'cat'              => $instance['category'],

with this code

// 'cat' => $instance['category'],
 'tag' => $instance['tags'],

3. Replace bellow code – line 178 

$instance['category'] = (int) $new_instance['category'];

with

// $instance['category'] = (int) $new_instance['category'];
 $instance['tags'] = $new_instance['tags'];

4. Replace bellow code – line 200 

$category = isset($instance['category']) ? absint($instance['category']) : 0;

with

// $category = isset($instance['category']) ? absint($instance['category']) : 0;
 $tags = isset($instance['tags']) ? esc_attr($instance['tags']) : '';

5. Replace bellow code – from line 200 to line 226

<p><label for="<?php echo $this->get_field_id('category'); ?>"><?php _e('Category:','dw_focus'); ?></label><br>
 <?php wp_dropdown_categories(array(
 'show_option_all' => 'All categories',
 'hide_empty' => 0,
 'id' => $this->get_field_id('category'),
 'name' => $this->get_field_name('category'),
 'selected' => $category,
 'class' => 'widefat',
 'hierarchical' => true,
 'walker' => new DW_Walker_CategoryDropdown()
 ) ); ?>
 </p>

with

<!-- <p><label for="<?php echo $this->get_field_id('category'); ?>"><?php _e('Category:','dw_focus'); ?></label><br>
 <?php wp_dropdown_categories(array(
 'show_option_all' => 'All categories',
 'hide_empty' => 0,
 'id' => $this->get_field_id('category'),
 'name' => $this->get_field_name('category'),
 'selected' => $category,
 'class' => 'widefat',
 'hierarchical' => true,
 'walker' => new DW_Walker_CategoryDropdown()
 ) ); ?>
 </p> -->
 <p><label for="<?php echo $this->get_field_id('tags'); ?>"><?php _e('Tags:', 'dw_focus' ); ?></label>
 <input class="widefat" id="<?php echo $this->get_field_id('tags'); ?>" name="<?php echo $this->get_field_name('tags'); ?>" type="text" value="<?php echo $tags; ?>" /></p>

6. Open file custom.js in your site / wp-content / themes / your theme / assets / js / custom.js
Replace bellow code – from line 33to line 40

for( var key in navs ){
 if( navs[key].length > 0 ){
 navs[key].find('li').each(function(){
 $(this).removeClass('active');
 });
 navs[key].find('li').eq(index).addClass('active');
 }
 }

with 

for( var i = 0; i < navs.length; i++){
 if( navs[i].length > 0 ){
 navs[i].find('li').each(function(){
 $(this).removeClass('active');
 });
 navs[i].find('li').eq(index).addClass('active');
 }
 }

7. To query by the tag you please add tags as below image:

Hope this helps!