As a teacher you have the ability of viewing sections that you have been assigned to. This is how you will enter into your sections so you can control grades, attendance, etc for your class. The sections are assigned to teachers on the admin level, if you do not see a section you need then you may need to contact an admin for your school. They should check the settings for that section then ensure you are assigned to the proper ones. You also have the ability of viewing sections you were assigned to in previous terms. If you need to view previous sections, or switch to the current term then you can use the drop down at the top right of your screen.