Add/Edit/View Dataset Source Information

CODAP has a built-in feature to store information with each table about the source of a dataset, its import date, and a longer description of the dataset. To add, edit, or view information about a dataset, click on the i icon at the top of the bar that appears to the right of the table. A "Dataset Information" window will appear. You can add/edit information on the source of the data, the import date, and a longer description of the dataset. Make sure to click "Apply" to save any edits you make. 

Some people prefer to put information about a dataset/its source in text boxes in CODAP. You can read more about text boxes here.