For textbox controls, you would assign a value to the .Value property. For labels you would assign a value to the .Caption property.
So something like ...
Code:
Dim MyDate As Date
MyDate = InputBox("Please enter a date", "Date Needed")
Me.LBLDate .Caption = MyDate
You would also add some code to catch any errors. For instance, the user may type in a value that is not an actual date.
Another approach would be to assign whatever the user types into the input box to the label's caption property.
Code:
Me.LBLDate.Caption = InputBox("Please enter a date", "Date Needed")