how to didsplay order of posts

Hello,

I have feeded roller to display at my front page.  For some reasons the new feed
always display at the bottom.  

For example I have 3 feeds.

First 2 feeds was displayed proper in order.  Something like

feed 1
feed 2.

later i have added new feed 3.  I want to show new feed 3 stay on top...Like

Feed 3
feed 1
feed 2

All i want is to display a newest feed on top.  Does anyone know the trick...
this is a code i'm using

<CSR:RollerPostListing id="rollerposts" runat="server"
/>

Thanks for your help,