February 17, 2019 5:48 PM
I can see you have activated static home page at http://tasso.nl/test2. On this case, you cannot activate our default slider. Default slider can be activated only if you set homepage settings to recent posts. I can see if you activate recent blog posts settings for homepage you cannot have the same design as you have currently.
Here, if you wish to keep a static page as homepage setting ( not recommended for blog theme ) you should use 3rd party plugin to activate the slider.
Hope this makes sense.