Go to [https://sheets.google.com](https://sheets.google.com)
Click the “+ Create” button
Select “Spreadsheet”
Enter a name for the spreadsheet
Select the cell or range of cells you want to add the data validation rule to
Click the “Data” tab
Click the “Data Validation” button
Select the type of data validation rule you want to add
Enter the criteria for the data validation rule
Click the “Save” button