How do I change iCloud IMAP 'alias@icloud.com' email address?

Okay folks.

I am prone to typos, especially on iDevices.

I setup a new iCloud account on my iPhone and when it asked me to pick an alias for xxx@icloud.com, I did a typo.

Is there a way to correct this?

Here are more details.

For logging in the iCloud account email is blahblah@gmail.com(I am good with this, don't need this changed, want to keep this as is, thanks)

The email address I created for iCloud is bblahblah@iCloud.com(the iCloud IMAP email address shown when you go to settings in iCloud.com, email, actions menu (cogs wheel), preferences, account, email address field)

What I wanted to create was blahblah@iCloud.com

How do I modify this (without restoring to creating a new alias account)?

Thanks