Look for the following code on your page:
<div class="fieldGroup"> <span> <img src="webassist/captcha/wavt_captchasecurityimages.php?field=Security_Code&transparent=false&noisefreq=25&noisecolor=a6b0c2&noiseorder=10&font=fonts/MOM_T___.TTF" alt="Security Code" class="Captcha" /> </span> </div>
Select any of the CAPTCHA-specific code (like noisefreq=25& ) and the edit CAPTCHA button will appear in the property inspector. Click to enter the editing wizard.
Or to manually edit, just change the values for noisefreq=25& and/or noiseorder=10& in your code.