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Here is a simple video tutorial on installing ChronoForms in Joomla! 2.5.
Please check this video:
Please check that you have downloaded the correct version of ChronoForms for your Joomla! installation. The install packages with J1.5 in thier name are for Joomla! 1.5; install packages with J1.6 in the name are for Joomla! 1.6, 1.7 or 2.5
For some people the normal automatic Joomla! extension installation process won't work. If this happens to you use the Manual installation process. There's a short video from Joomla! NutShell