как в этой теме включить слайдер: http://cudazi.com/mono-wordpress-free/

Там папка с хелпом есть, где все описано

Slider Setup
Creating Slides

From the left menu, click Slides > Add New
Enter a Title
Enter content in the main content area. Use images, video or any content you would like but try to keep the slides roughly the same size.
In the Slide Settings box at the bottom, enter a width / height on every slide to be sure the slider resizes properly.
Create / choose any Slider Categories
Click Publish

Adding Sliders to Pages/Posts

After you have created slides, you can display them using the slider shortcode. See the shortcode section.
[cudazi_slider slide_delay="4000" slide_effect="slide" slide_disable_nextprev="yes" ]
Также в теме предусмотрен импорт конетента, тогда будет как в демо (файл posts.xml)
Import Sample Content

Go to tools: Import > WordPress (you may need to activate and install the importer if prompted)

Use the included XML file I have provided in the download.

When asked, check the box to download and import file attachments.