What Happened to my Username?

It got changed and I can't figure out how to change it back. Maybe I'm just too tired to think, but I could change my gender, my avatar, signature (which I don't have), etc. But no way to change the username back.
Thanks for any help/advice.
lamb_somestupidwaytoolongnumber aka D. aka the former VuDu_DawL
Comments
It's been a while since I have done it but I believe you technically change that in the store area rather than the forum area. So click on the green icon in the top-right, go to "My Account" and then click Edit in the section where your name and email address is listed. It should be in there.
Is here https://www.daz3d.com/customer/account/edit/
I was also looking for a way to change it. Thanks.