How to enable ReCaptcha in Joomla 2.5

Step 1: Login to the Joomla adminstrator control panel.
Step 2: In the top menu, over “Site” and click “Global Configuration”.
Step 3: Under the Site tab, set “Default Captcha” to “Captcha ReCaptcha”, and then click ‘Save’.
Step 4: To obtain a Recaptcha key, you need to have a Google account. If you don’t already have one, sign up for a Google account and then visit https://www.google.com/recaptcha/admin/create .
Step 5: Enter your domain name and then click Create Key. You will then be given both a Public Key and a Private Key, which will look similar to: 6LfnOM47AAAAAB7SSA7fbjH7e1q95htZb34pA1T9.
Step 6: ow that we have our ReCaptcha keys, we’ll need to configure Joomla 2.5 with them. In your Joomla 2.5 Dashboard, hover over Extensions (in the top menu) and then click Plug-in Manager
Step 7: Use the Filter feature to search for captcha, and then click on the Captcha – ReCaptcha link.
Step 8: Enter your Public and Private Key, and then click Save.