If I remeber right, those instructions assume you have the active users mod installed. Here is where you should place the code if you don't have that mod installed:
if Request.Form("Method_Type") = "Modify" then
'########################
'## Anti-Spam Code Start
'########################
'We check that the page calling the profile is the register.asp
If Right(Request.Servervariables("SCRIPT_NAME"),12) = "register.asp" then
'Defining the randomized code
'We define the number of images to show
HowManyNbr = 6
'We loop through the Number Generating to get all the HowManyNbr
NumbersToShow = ""
Randomize
For I = 1 to HowManyNbr
NumbersToShow = NumbersToShow & Fix(9*Rnd)
Next
'We will now decode the randomized numbers (Very Simple)
RandomizedCode = NumbersToShow * 50000 - 17456
'We genearte the table now
Response.Write " <tr>" & vbNewLine & _
" <td valign=""top"" align=""center"" colspan=""2"" bgcolor=""" & strCategoryCellColor & """><b><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """ color=""" & strCategoryFontColor & """>Registration Anti SPAM Confirmation</font></b></td>" & vbNewLine & _
" </tr>" & vbNewLine & _
" <tr>" & vbNewLine & _
" <td bgColor=""" & strPopUpTableColor & """ colspan=""2""><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """>" & vbNewLine & _
"Your unique registration code</b><br>If you do not see any numbers, or see broken "& vbNewLine & _
"images, please contact a board administrator to rectify the problem.</td>"& vbNewLine
Response.Write " </font></td>" & vbNewLine & _
" </tr>" & vbNewLine & _
" <tr>" & vbNewLine & _
" <td bgColor=""" & strPopUpTableColor & """ colspan=""2""><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """>" & vbNewLine
Response.Write "<input type='hidden' name='regid' value='"& RandomizedCode &"'>"& vbNewLine
'We now define the images
'Again we loop through to get the image number
NullStop = False
Response.Write " </tr>" & vbNewLine & _
" <tr>" & vbNewLine & _
" <td bgColor=""" & strPopUpTableColor & """ align=""right"" valign=""middle"" nowrap width=""10%""><b><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """><font color=""" & strHiLiteFontColor & """></font> </font></b></td>" & vbNewLine & _
" <td bgColor=""" & strPopUpTableColor & """><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """>" & vbNewLine
For I = 1 to HowManyNbr
Response.Write "<img src='register.asp?code=image&rc=" & RandomizedCode &"&p=" & I & "' border='0' alt='Code'>"& vbNewLine
Next
Response.Write " </tr>" & vbNewLine & _
" <tr>" & vbNewLine & _
" <td bgColor=""" & strPopUpTableColor & """ colspan=""2""><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """>" & vbNewLine & _
"<b>Confirm registration code</b><br>To prevent mass registration programs from registering " &_
"accounts, please enter the 6 digit code shown above in image format.<br>Note: Only numbers are " & _
" allowed, a '0' is a numerical zero, not the alphabetical 'O'.</td>"& vbNewLine
Response.Write " </font></td>" & vbNewLine & _
" </tr>" & vbNewLine & _
" <tr>" & vbNewLine & _
" <td bgColor=""" & strPopUpTableColor & """ align=""right"" valign=""middle"" nowrap width=""10%""><b><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """><font color=""" & strHiLiteFontColor & """>*</font> </font></b></td>" & vbNewLine & _
" <td bgColor=""" & strPopUpTableColor & """><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """>" & vbNewLine & _
" <input type='text' size='7' maxlength='6' name='reg_code' class='forminput'>" & vbNewLine
Response.Write " </font></td>" & vbNewLine & _
" </tr>" & vbNewLine
End If
'#######################
'## Anti-Spam Code - END
'#######################