InputBox returns a String.
prompt
A string that is displayed usually to ask for input type or information.
title
A string that is displayed at the top of the input dialog box.
default
A string that is displayed in the text box as the default entry.
xpos and ypos
The x and y coodinates of the relative location of the input dialog box.
Example
Sub Main
Title$ = "Greetings"
Prompt$ = "What is your name?"
Default$ = ""
X% = 200
Y% = 200
N$ = InputBox$(Prompt$, Title$, Default$, X%, Y%)
End Sub