Slider in Regal Theme - Add navigation or replace?

Is it possible to add navigation buttons to the slider? Or is it possible to replace the Regal slider with the Golden Eagle slider?
Thank you.

 

To activate navigation go to
Theme directory > js > custom.js
and edit it as shown in image.

 

Thank you! Is it possible to change the word "Prev" to "Previous"?

 

For this go to the

Theme directory > js > slides.min.jquery.js
Search "prev" and change fifth search result to "previous".

 

Thank you so much!