This section allows you to set information for your project which is used when it's exported as a template.
Here you can assign an image, icon and description for the template project, however this will only be used when it's actually exported as a template. You can do that by opening the File Menu, hovering on "Export Project" and selecting "As Template".
Any templates you create will be tied to the account you are logged in with. If you later log in through a different account, you won't be able to access the same custom templates.