There is no way to "change your username" yourself at the moment. It can be done, but it requires a developer request. It could take some time. I suggest, since you only have one posting, to delete your account. Then you can recreate with whatever username you like.
There is no way to "change your username" yourself at the moment. It can be done, but it requires a developer request. It could take some time. I suggest, since you only have one posting, to delete your account. Then you can recreate with whatever username you like.