Hi,
I posted 2 items to my blog--the first one is in February 2010 and the next in august 2010. it has the august one first. I can't seem to get the feb one in front.
what you can do is go to your blog entries and click the blog entrie you want to put first. Then in the edit part click Duplicate. it will automatically put that entrie on top. then go and delete the original that you duplicated.