To save, you need to create an account, which the program will automatically offer you. If you already have an account, you just need to log in. When you save, you will need to give your plan a name, you will find it under this name and you can continue planning at any time. If you are a designer you can create your own library of your models and share it with your clients. If you want to continue designing later, you can access your saved models by clicking the open button.