Change Username to Reflect Display Name

Hello there. Please change my Username (titatattle)  to reflect my Display Name of 'Lady Ajumma'. Many thanks!

 Sunset:

yes but I'm pretty sure they they're talking about their profile link https://mydramalist.com/profile/titatattle 

they want "titatattle" to be "ladyajumma" to match their username.. I use MAL too but the link there matches your username when you change it, in MDL the link remains the same as the original name you signed up as. 

Correct :) Display Name and Username is different.  Apparently you can change your Username every 30 days via the MDL app, but I couldn't do it.