Question

I look over the classes that can be taken, but could you explain me how do i submit the work? How can i get the class credited?

Answer 1

for the MIT OCW courses, you do not submit work or get credit.
You can ask questions here and post code for critique

This course is given at edX which does give 'credit' and has a way to submit your work.
https://www.edx.org/course/mit/6-00x/introduction-computer-science/586

Answer 2

Yah watch out for the next offering of this course on edx