How Do you Update Your Login Name Within the Community?

Here's what I've done so far:

1. Created a new user in the community (new_user).

2. Assigned that user a role (role_a).

3. Gave permissions to users with role_a to be able to "Change own login name" under the "User Management" section.

4. Logged in with new_user.

5. Clicked on my login name in the upper right corner (next to logout).

6. Clicked the "edit my profile link".

7. Under the personal profile tab, I expected to see a "Login" tab, but I don't (I expected this because my admin account has it there, and is able to update the login name)

Is there something I'm missing?

Please help.

Kind regards,

Peter