I can't sign up for 15 minute free trial. I enter the required details (such as email, password, first name and surname, and check the privacy policy and terms and conditions boxes). Yet when I try to click on the "Sigh up" box after entering the info, the "Sigh up" box remains grey.

Here is the link to the 15 minute free sign up page.


Can you help me? What is the problem? Why can't I sign up for the 15 minute free trial. Can you recommend a solution?