Enroll button not showing up on courses?

http://digitalsmb.com/courses/digital-analytics-fundamentals/
http://digitalsmb.com/courses/how-to-create-an-ecommerce-online-store-with-bigcommere/

its like that for all courses.. they are set up to allow registered to sign up but the button in the course details page does not show up.

i have granted you access to admin