Even if you do not load data from the spreadsheet into the Custom Distribution dialog, you can still add and edit data using the data table. To do this, click the More button, 
, to display the data table. Then, you can:
Enter a different value in the data table and click Enter to change the data.
Type the minimum, maximum, probability, and step (if discrete data) into a blank row and click Enter to add new data.
To delete a single range of data, select that row of data, right-click, and choose Delete Row.
To clear all data rows, right-click within the data table and choose Clear Distribution.
To delete a single range of data without using the data table, click the range to select it and either: