The URL of your campaign page is generated as soon as you create your project. You may also choose to customize your campaign URL.
However, your project page will only be accessible to users (and thus potential contributors) when you your campaign is published online. Therefore, you will only be able to share your URL to your relatives or followers at this point.
In the meantime, only you will be able to access it, by signing in to your KissKissBankBank account.