Cannot Add/Upload Slider Images to New Slider

Afternoon,

I am running a clean WordPress installation with the Blackfyre theme installed. I am testing features/functions before I put this theme on my live site. So I am testing the sliders and when creating a new slider, I am trying to manually manage slides by selecting “Do not user post slider” from the post category drop-down, but there is no add image button available.

The only thing displayed is the slider title, the drop-down for the category, and the normal publishing options on the right pane.

Plugins Installed: Akismet, bbPress, BuddyPress, Disqus Comment System, WooCommerce. (fresh install, do not know if I need another plugin to manage slides (nothing in instructions)).

If anyone has any idea, would greatly appreciate it.

Cheers,
MK