Ask Veronika the site owner. Use the "contact us" at the bottom of the page.
I don't see anything wrong with your name. Welcome to Cute.
Not that I am aware of - but you could just start over - forget about this user name - not sure if you have to have another email account to do it or not - but you surely could try.
You can always grow another garden - if you don't care for the name that you are using. We would help you get many more. Just let us know.