I want to change my blogger theme,but i do not know how, could you tell me?
Should i go to find some beautiful theme and copy it on my blogger?

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China Wholesale|Cheap Mobile Phone|Cell Jammer

Do an Internet search for 'free Blogger themes' you'll gets lots of results.

When you find one you want to try:
1.Download a template and unzip.
2.Go to the Layout section in your blog (Dashboard → Layout → Edit HTML ).
3.Backup (download) your previous template (Download full Template).
4.Find and upload your NEW template.

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James M. Fisher, Microsoft Windows MVP
WindowsTalk: Enhancing Your Windows Experience!

Go to www.pyzam.com. They have the best themes, but most of their themes have a banner at the top which is easily fixable. If you do decide to use pyzam send me a message and I'll be more than happy to help you get rid of the banner.

Make sure to keep a copy of your previous code just in case, then put in their template. Easy as pie! Good luck!