Visual Basic Help

Hope someone can help me. I have ben given a excel file from another department at work as they had been told i know a bit about excel. Excel... Yes, Visual Basic... Nil, zilch, nada! It really might as well be written in chinese!!

What has happened is the guy who set this up has since been made redundant from the company and they now want the file to do one more thing.

Basically what they want the file to do is, when the user clicks the 'generate file' button, if E2 has no date entered then a message box pops up stopping the user from going any further until a date is entered.

Any questions please ask and i'll try to answer your questions.