Hey+hello+Leo!+You+can+start+the+course+directly+at+the+app+/+platform+when+you+click+inside+the+course.+The+button+should+be+like+this+if+you+are+using+the+mobile+app+version:

if+you+are+using+the+web+version,+you+may+want+to+take+a+look+on+the+upper+right+hand+corner+of+the+course+page.+There+is+a+button+"閱讀更多"+as+well! 

Enjoy+the+journey!