Inserting additional pages

[folly]

Your help is needed to guide on how to insert additional pages into this system generated script as all efforts to do so did not yield the desired results.

I want to insert the serial number page just after the
welcome page.

the serial key is defined as below
## Displays the serial dialog
Function SerialPageShow

!insertmacro MUI_HEADER_TEXT "Enter Serial Code" "Enter the software serial code to continue."

PassDialog:ialog Serial \
/HEADINGTEXT 'Please enter the serial code located on the software CD case...' \
/CENTER \
/BOXDASH 92 70 3 '' \
/BOXDASH 172 70 3 '' \
/BOX 252 70 3 ''

Pop $R0 # success, back, cancel or error

FunctionEnd

## Validate serial numbers
Function SerialPageLeave

## Pop values from stack
Pop $R0
Pop $R1
Pop $R2
;Pop $R3
;Pop $R4
## A bit of validation
StrCmp $R0 '421' +3
MessageBox MB_OK|MB_ICONEXCLAMATION "Wrong input!"
Abort

StrCmp $R1 '890' +3
MessageBox MB_OK|MB_ICONEXCLAMATION "Wrong input!"
Abort

StrCmp $R2 '576' +3
MessageBox MB_OK|MB_ICONEXCLAMATION "Wrong input!"
Abort

## Display the values
MessageBox MB_OK|MB_ICONINFORMATION "Authorised to install this application"

FunctionEnd

;////////////////////////////////////////
this is the main code
; Welcome page
!insertmacro MUI_PAGE_WELCOME
; License page
!insertmacro MUI_PAGE_LICENSE "userLicence.rtf"
; Components page
!insertmacro MUI_PAGE_COMPONENTS
; Directory page
!insertmacro MUI_PAGE_DIRECTORY
; Start menu page
var ICONS_GROUP
!define MUI_STARTMENUPAGE_NODISABLE
!define MUI_STARTMENUPAGE_DEFAULTFOLDER "HICA"
!define MUI_STARTMENUPAGE_REGISTRY_ROOT "${PRODUCT_UNINST_ROOT_KEY}"
!define MUI_STARTMENUPAGE_REGISTRY_KEY "${PRODUCT_UNINST_KEY}"
!define MUI_STARTMENUPAGE_REGISTRY_VALUENAME "${PRODUCT_STARTMENU_REGVAL}"
!insertmacro MUI_PAGE_STARTMENU Application $ICONS_GROUP
; Instfiles page
!insertmacro MUI_PAGE_INSTFILES
; Finish page
!define MUI_FINISHPAGE_RUN "$INSTDIR\HICA.exe"
!define MUI_FINISHPAGE_SHOWREADME "$INSTDIR\README.txt"
!insertmacro MUI_PAGE_FINISH

; Uninstaller pages
!insertmacro MUI_UNPAGE_INSTFILES

; Language files
!insertmacro MUI_LANGUAGE "English"

; MUI end ------
;/////////////////////////////////////////////////////

thanks upfront

[JasonFriday13]

Put this command after the '!insertmacro MUI_PAGE_WELCOME' command:

code:
page custom SerialPageShow SerialPageLeave