Your MyGet username is a critical data point in our systems, and we do not support changing your username at this point.

If you really feel strong about it, you can create a new account using the desired username, and transfer your feeds over by inviting the new account as new feed owner.

Before doing so, please note you should verify your new account has the proper subscription level to support the private feeds and quota of your current account.

More information about adding a feed owner can be found in this MyGet Documentation article: http://docs.myget.org/docs/reference/security#Adding_a_new_feed_owner