Before entering in your data, you must first create a schema. Once your schema is defined, you can start creating items on the Create Data Window.
Open the Create Data Editor Window
Select the schema type you’d like to create an item for, and give it an ID. Note: The item ID can be a number, a descriptive name i.e. water_level, or a combination of descriptive name and numbers, level_10.
The new item will appear in the item list with the ID you specified, and any default values that were set in the schema. Note: You can rename an item’s ID by double clicking the ID.
After setting all the values for the item, be sure to Save your changes!