Quote from: MP4 on January 19, 2018, 11:10:43 AM

Is there any restriction for changing username on btt?

Yes.

It is not possible (to do yourself), unless you have a really good reason to do so, and i'd presume a high level account ( Sr/Hero/leg). If that's the case you should email either theymos or Cyrus, and they *might* be able to change it for you in a few months.

Or, you can donate 10 bitcoin as OmegaStarScream already stated.

https://bitcointalk.org/index.php?topic=285427.0

Atleast that's what a mod said a couple years ago.