Change the quantity to the number of months you’d like to sign up for. You can look at the menu in the sidebar to see how many sections you have left (there are 12 total in the Academy, and 6 total in the Academy Light).
Then I’ll have to manually add you to the new sections, which I’ll usually be able to do within a few hours as long as I’m around.
You can upgrade all of the remaining months, or just some. If you do just some, your subscription will automatically continue after that. You can upgrade manually as often as you want.