You can set your education by going to your profile page and clicking the education tab. At the bottom of the page you'll find the + button. Click it to start adding a new education.
Below is a brief overview of all the fields:
This is the institution at which you got your education. For example, this could be the name of your school.
This is the name / description of the education you received. For example, Physics.
This is the type of education you received. For example, a bachelors degree. If you can't find the type you're looking for, then you can request it to be added. Learn more.
This is the (expected) date of completion of the education.
If you want to learn more about changing your education, then please read this article.