As a normal member here we can't change our name chosen but if you are staff here you can do that.
As far as I know, a staff member here who change their name is our mode in local. Rickbig to
Mr. Big I think only Global Moderator can do that.
I saw last time Cyrus changed his name too to Smiley Cyrus, it's a feature that's only allowed for staffs and higher positions.
When I enter the account related settings this part is blocked with no button to edit.
It means you can't, I'm also curious why you want to change your name? the options were given to you above.