Nanostudio 2 has been discontinued, and may not be visible as an option in the main list of Kit Maker formats.
View the top Menu > Formats to access the Nanostudio 2 option for processing.
View the Kit Maker: Nano Studio 2 Video for overview and instructions. The video does not have the latest Kit Maker features such as automatic sorting, but it shows how to transfer the files.
Transfer your Nanostudio 2 kits to your iOS device. They will be ready to load as presets. Go to the Transferring to iOS Devices section (below in the manual) for more information, or watch the Nanostudio 2 video provided.