Hello,
If you know php and html, you should edit your theme, but if not, please follow to below instruction:
1. Go to your admin panel and themes section. From dropdown menu choose editor and at new page find on the right column the file called style.css
2. Click on the file and inside editor go to the last line.
3. Copy and paste this code, then save.
.entry-title .category {display: none;}
4. Go to your page and refresh browser.
Modifying theme files is not ideal as those changes will be lost when the theme is updated. Much better to use a custom CSS plugin.
I used my costum CSS plugin and added this code, didnt work.
http://postimg.org/image/oi4gvy3t7/
Can anyone understand what is the problem?
Not without seeing the actual site.
Oh sorry, I see you posted it above.
Have you asked the developers of the theme about this?
http://cosmothemes/megusta