Say for example you are currently in 7th grd and you want to change it to 8th. I am not sure if this works for other browsers, I am using google.

• On your dashboard, click on edit courses.
• Initially when making your account you get an option for your class and then what courses you want.
• On the bottom left corner of the pop-up / box you will see a button saying Back. Click on that
• You will then see the options from which you can choose and then choose your grade.

P.S. I don't know if you can zoom into the picture, I'm sorry.