The lights are on
Well,first you have to be on your profile. Click "edit profile"
You should now be able to see editable boxes in the fields for "magazine subscription #" This is where you are going to put your 8 digit subscription number. (If you click on the picture of the magazine it should show you where to locate that. And for digital users it should be in the email you were sent.) and after that you should be all set. :)
Also make sure you select "save profile" afterwords.