image Problem

Hi guys, I want to thank all the members here makes such a huge
community, I need some help, if possible, please give me an answer

I am using zbench theme http://ww.wp.xz.cn/themes/zbench

my problem is when i add image in a post that image is not showing on the main page but working in the post i upload that image in the image hosting server

here is the same example

Post Screentshot
http://www.imgnow.net/uploads/714081024example.jpg

But on the main page, the image is not showing
here is the example http://imgnow.com/uploads/714081032example_2.jpg

hope someone understand thanks you in advance for help

feature function works fine, but I do not want to use this function
becose that function resize image automatically