To open Add Input Pad dialog:
Open a new or saved document. Click on Add Input Pad button 
 in the toolbar of the main dialog.
OR
| 
 1.  | 
 Open new or saved document.  | 
| 
 2.  | 
 Select Document tab in Properties Editor.  | 
| 
 3.  | 
 On Document tab find Input Pads property category. If necessary, scroll down to the very last row in the Input Pads property category till you see the cell saying "Add".  | 
| 
 4.  | 
 Click the cell with "Add" to open Add Input Pad dialog.  | 
There are two fields:
| 
 1.  | 
 Name:  | 
 The name of the input pad.  | 
| 
 2.  | 
 Width:  | 
 Select a named constant that specifies the width in bits of a vector, or Unused if it is one bit.  | 

Fig.3 Opening Add Input Pad dialog
