adding a captcha form - Joomla! Forum - community, help and support

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hi all,
i'm newbie joomla , being spammed unwanted registered users signing website, www.capriconvertible.com know how can change signup form captcha?

thanks in advance, bob

starting joomla 1.6 have captcha feature
http://magazine.joomla.org/issues/issue-jan-2012/item/654-what-s-new-in-joomla-2-5
if don't core feature there lot of 3dp extensions on jed
http://extensions.joomla.org/extensions/access-a-security/site-security/captcha





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