To ask if anyone knows why mumsnet won't let me change my username?

[Mnk711]

I wanted to change username as I do every now and again but mumsnet won't allow it and says I can only post under my current username or a previous one. Anyone know why?

Sounds like you’re trying to change it in the ‘create a post’ section rather than on your profile. Click the top right corner person icon, should take you to where you can change username