Username change?

[Its Pretty]

So I wanted to change my username, but couldn't find the option. I know I changed my username before approximately 5 months ago. has the rules changed or did I miss something?

[Emerald Dream]

You may change your username (once) at any time after you register. After that, it is once every 180 days (six months).

[Its Pretty]

You may change your username (once) at any time after you register. After that, it is once every 180 days (six months).

o thx