Goto your front page anf login as admin. There is an arrow button on the left, click on it and then drag the Featured Content block place it on the blue areas. Then save the blocks, refresh page you will see a button to add content to slider.
Turn of ckeditor in easypopup and use the html in popup's content
<div style="text-align: center; margin: 10px;">
<a href="http://yourdomain/" class="ipsButton ipsButton_primary b-close">Your button</a>
</div>
I will update the reset button in ACP for admin to reset the popup cookies, but I will not update the button.
Try to set max slides = 1, min slides = 1
And edit your theme > featuredcontent > front > embed > showSlider
Find
height:{$height}; width:100%;
Replace by
max-height:{$height}; width:100%;
Save