To change an Excel validation rule, perform these steps: Select any of the validated cells. Open the Data Validation dialog box (Data tab > Data Validation). Make the required changes.

To add data validation in Excel, perform the following steps. 1. Open the Data Validation dialog box Select one or more cells to validate, go to the Data tab > Data Tools group, and click the Data Validation button. You can also open the Data Validation dialog box by pressing Alt > D > L, with each key pressed separately. 2.

For example, you could use data validation to make sure a value is a number between 1 and 6, make sure a date occurs in the next 30 days, or make sure a text entry is less than 25 characters. When a user enters an invalid value, data validation can display a message telling the user what is allowed, as shown below:

Excel Data Validation is a feature that restricts (validates) user input to a worksheet. Technically, you create a validation rule that controls what kind of data can be entered into a certain cell. Here are just a few examples of what Excel's data validation can do: Allow only numeric or text values in a cell.