Excel cell fill in instructoins

Hi,

This one of the Data Validation options called (Input Message).

To access to, select the cell that has the input message box, then follow this path:

Data >> Data Tools >> Data Validation >> Input Message

Since the cells that have the Data Validation are merged with other cells in your worksheet, you may see a message box pops up and asking you to extend the Data Validation to them.

If so, click Yes to be able to see the Input Message.

Hope that helps

Regards

Data->Data validation->Input message