Did you enter no in the field during signup? If you leave it blank, it will assume you are a spambot.
If you can't get it to accept, click the "contact us" link at the bottom of the page to send an email and we'll set it up from here. Let us know what username and password you want to use. Also tell us what blog name you'll use. This is the part in the url such as 3fatchicks.com/diet-blogs/blogname
. This cannot be changed once set, but you can create and change the blog title as often as you want. The blog title appears at the top of your page such as "my journey".
I hope that helps