Unable to change username.

I was looking for a new Minecraft name today, when I noticed a nice name: Animate. Now I thought that I could try and get it since it was available. However, when I tried to change it, it did not work, would it be possible that the reader could change the name for me? I would appreciate it. If further information is needed, such as email and passwords, I shall email back once I get a response. Thank you.

-Sam