Taking a Free Course

Hi, I am very new to this, so please bare with me.
When users go to enrol in a course they reach the page with the overview, curriculum, instructor etc.
If they click the button to take the course it take them to http://www.siteurl/wp-admin they can access it if they go to curriculum and click on the lessons there though?
Any ideas what I might be doing wrong?

I’ve suddenly realised that this is a new trick and I’m an old dog…

The page I need help with: [log in to see the link]