need help to blogging.............

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i have created a blog. and posted an intresting topic MAGIC , and after few days i got some MAGIC TRICKS , first iposted magic, and then my second post is MAGIC TRICKS. NOW my blog has MAGICpost as main page, but when i trried to post MAGIC TRICKS post, my first post apper at second position and second post appears in first place, now my question is -how to bring my first post on top of my blog/first position..........pls help me Kkittu:)