centita theme slider problem

I am using centita wordpress theme on my site.

I am unable to update slider images.

I have checked every thing in dashboard, but could not find the solution.

Currently slider images are coming from post as per theme setting.

When i open post i can only add text, so the text appears.

Here is my site, http://www.healthy-blood.com/

Please any one help, Thanks in advance.

Regards