custom meta data for courses in CoursePress Pro

hi Dear,
I want to add some custom meta data to courses
how can i do ?
which filter hook and function i must use to add these custom metas
A - Courses dashboard : the page that we make and publish courses.
B - to show these new custom metas in courses pages for users.

a Custom meta like :

Course Level :
1- Easy
2- Moderator


Thanks a lot for CoursePress Pro
I am Going to Make a Professenal Educational Site by this plugin.

Hamed Nourhani