SOLVED! I had the link in the wrong place.
It should look like this
It was the gap between the a and the class that confused me.
At least this is working for me – if this is not the correct way of doing it perhaps someone will correct this post.
I think if you want to change the button style you change the “btn” to the options here http://demo.styledthemes.com/preference/form-elements/
Hope that’s all correct!
Thanks, Em