How to put image in gamepress theme's slider?

how can i manually put images in slider by means of coding of it?(gamepress theme)

i tried to put images into it by posting and setting a featured image into it.but i don’t want to show it on my home page.i’ve tried to hide the post and it seem that the prob got worst.is it possible to hide the post without causing it to hide the images in the slider?
or just simply.how can i put an image in gamepress theme’s slider?