I want to have a pop up window appear that the user can input more
information into it and then transfer that information to another location in
the spreadsheet.

In my worksheet I have the user input a name in cell A1. When this name is
entered, I would like to have a pop up window appear asking the user to input
the birthday of the name just entered. Once the user enters this information
and closes the pop up window this birthday information is entered into cell
A139, which is then used for other programming of the worksheet.

I have never done this sort of thing before and am totally lost, please
someone help!

Thanks,
Russ