chaos!!

arhhh!! what have i done to my blog. I tried to post a video and then, i did something i don't know to the "edit HTML" and my blog became messed up. everything just shifted extreme left and then tagboard and archive went to bottom. it is irritating. i hate that sort of things. it really spoils my mood and enthusiasm. can someone sort me out on this? i need help. nevertheless, i will carry on despite the ugly and distracting view page.