I carelessly forgot to change the domain section of the new SG email address I created and thus ended up with "HelloWorld.myusername@spamgourmet.com" when I wanted to have "HelloWorld.myusername@neverbox.com". When I tried to create "HelloWorld.myusername@neverbox.com", the website says
"A disposable address for the word HelloWorld already exists. You may use it or create a new address with another word."
How can I now create HelloWorld.myusername@neverbox.com?