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thanks, and I put 3.0 steem in the box and clicked continue and signed in with existed account, is that it? nothing actually happend and I went to the link http://steemd.com/@accountname but I don't know if it worked. could you let me know? sorry I am kind of dummies about this kind of process. and thanks.

Did you put in the actual account name in for “accountname”?

yes, there is some information coming up with my previous account(this), but nothing with the new account name(it says 'page not found').

If it says page not found, then the new account did not get created.

Eventually, I created another account with the name I wanted. thanks for your help and have a good day =)