There are two types of InputBox techniques.  The Method and the Function.  I
suggest that you use the help facility to read about each type.  To answer
your specific question:

Suppose you use the sytax:
                                       Sub InptBx()
                                          Response = InputBox("Enter your
name.", "Name")
                                          ActiveSheet.Range("A1") = Response
                                      End Sub
"Response" will return whatever is entered by the user into the input box.  
The nest line of code puts that data into Range("A1").

have you considered using a userform? It may be better if you have multiple
questions. Or maybe just list the questions on a spreadsheet and let them
type into (coloured) cells.