You can access your Sonoran Software account by going to account.sonoransoftware.com, or by selecting "Modify" in the side menu's account modal.
On the Sonoran Account website, select Account > Advanced > Delete Account
This will send an email confirmation to the address on file.
Check your email for an account removal request and click the "Remove Account" button. Having trouble seeing it? Be sure to check your spam/junk folder.