Please Help! Need some theme editing help!!!

Hello,

I am new to editing wordpress layouts and have been working on this one I downloaded last night http://nba-247.com/vr/

I am satisfied with the header/top part and the bottom/footer. The part I want to edit is the middle chunk of the theme where it says UNCATEGORIZED and has the 3 images twice.

What folder and after what code does this middle part start so I can delete all of it and start trying to put what I want there. Is there an easy way to do this? Any help would be great! Thanks!