If you are unable to create an account because the Create account button is disabled, it is likely for one or more of the following reasons:
1) First name, last name too short (must be 2 characters or more, each)
2) Invalid email address
3) Invalid password (less than 8 characters long)
4) Password confirmation does not match password field
5) Accept terms of service not checked
Please check these fields carefully. If you're still having trouble, please open a support request and include a screenshot showing this screen with the fields completed.