Hello @jose-orlando-mora,

The slider of the University Hub Pro can be set using the post, page, category, Images.

So if you set the slider using the post, category, you can change the image from the featured Image section of individual post edit screen.

Similarly, if you set using the page then go to individual page edit screen and change the image in the featured image section.

For clear information please refer to below given link:

http://prntscr.com/kqjapr

Also, for any confusion further you can refer to our theme’s official documentation given below:

http://themepalace.com/instructions/themes/university-hub-pro/

Hope this helps.

Regards!!