An option is a list of values that do not affect the product preview. For example, you can create an option to let the end-user choose sizing:
Option Name: Sizing
Values: XS, S, M, L, XL
Values can have a name, a production code, a description and an image thumbnail.
To add an option, log in to your MyCustomizer dashboard, go to your product page and click on BUILD.
On the left side of the screen under the Product tab, click on the ADD button, then click on Option.