Xoxo.com does not explicitly mention the ability to change your username after it has been created. Typically, usernames are set upon account creation and are intended to remain constant to avoid confusion and maintain account security. However, Xoxo.com may provide options for account management that could include updating personal details. It is advisable to check the account settings or profile management section on the Xoxo.com website for any available options related to username changes. Additionally, if assistance is needed, it might be beneficial to look for relevant contact information on the site, as customer support may be able to offer more guidance on this matter.