Change the Name of the Account from user to event name

When completing the form, it asked for company.  I inserted the name of my company, SME.  Then it asked for a name.  I think I was supposed to give a name to the account.  I entered my first last name.  I would like to change it to the name of the event.  How do I change it?  I don't see a tab for 'my account' or edit account on the site.

Thanks

We can help you changing your username, please provide us with at least 3 possible usernames that you would like to use, we will change it to the first one available. 

Looking forward to your response.