I sell a type of shirt and as the main image for the shirt i have a picture of the front of the shirt. Right now on the site i have 2 different models for the shirt because they have different designs on the back. Each model has a name and a picture of the the back for it. Now i want to add a 3rd model with a 3rd name and image, how can i do this? I went to Adding New Attributes but i don't know how to add a new Option value for the new shirt model.