How to add a slider under the header?

Hi, sure I am missing something simple but can't figure it out - takes me a while to adjust!

I am trying to use Easing Slider with Gridmarket, but I cannot figure out how or what to do to get it to show on my site. If there is a better slider to use I am willing to change, and follow advice, as only just starting to set everything up.

If somebody could give me some basic advice, what code I need and where to put the code to get the slider to show under the site header I would really appreciate it.
https://premium.wpmudev.org/forums/#
Thank
Nicola