Here you go.
In register.asp look for:
Dim strURLError
ABOVE that add:
Then look for:
if Request.Form("Password") <> Request.Form("Password2") then
Err_Msg = Err_Msg & "<li>Your Passwords didn't match.</li>"
end if
end if
AFTER that add:
Then look for the third instance of:
WriteFooter
AFTER that add:
'#### Antispam modification
end if
'#### Antispam End
Lastly, make sure the number image files are where all of your other forum images are, most likely a folder named images.