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There is any way to change the username of account.
Of course, you can donate to the forum for 50 BTC and you will become a VIP and you can edit your username, also you can also customize your own title. For more details visit: https://bitcointalk.org/donate.html
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Because my old account has been banned, So I just created this account to continue with this forum. I mistakenly have chosen this username, So I want to change this. There is any procedure to change the username.
Oh really? get ready to receive a negative trust then. Why? You should know that when you receive a ban or your original account is banned you can't create a new account it will result as a ban evasion well you can take a look at number 25 of the unofficial list of bitcointalk forum: https://bitcointalk.org/index.php?topic=703657.0
Don't say like this. I also want to gain knowledge from this forum and in FUTURE I will never break the rules of the forum.