Go in <code>General parameters</code>><code>Portal</code>><code>Captcha</code>:
</p>
<ul>
<liclass="level1"><divclass="li"><strong>Activation in login form</strong>: set to 1 to display captcha in login form</div>
</li>
<liclass="level1"><divclass="li"><strong>Activation in password reset by mail form</strong>: set to 1 to display captcha in password reset by mail form</div>
</li>
<liclass="level1"><divclass="li"><strong>Activation in register form</strong>: set to 1 to display captcha in register form</div>
</li>
<liclass="level1"><divclass="li"><strong>Size</strong>: length of captcha</div>
</li>
<liclass="level1"><divclass="li"><strong>Captcha module name</strong>: Apache session module used to store generated captchas</div>
</li>
<liclass="level1"><divclass="li"><strong>Captcha module options</strong>: options for above module</div>