This guide only works if the old page was minimum Joomla 2.5 or higher ! Joomla 1.5 has a other database structure as Joomla 2.5 or 3.5, therefore you must migrate Joomla 1.5 installations previously before you can use the Joomla user tables.
Important! Create a complete backup before beginning!
Export all Joomla user tables from your old page
Export all Kunena tables from your old page
Copy the folders avatars and attachments (path is media/kunena)
Install a new Joomla
Drop the Joomla user tables from the new database
Import the Joomla user tables and all kunena tables in your new page
Mark all tables with old prefix and rename the table prefixes to the same as in your new data base
Go in backend to Extensions -> Manage -> Database and check if it’s ok. Otherwise click on the Fix button.
Paste the content from the folders avatars and attachments in your new page (path is media/kunena)
Go in backend to Kunena -> Tools and Synchronize Users and Recount Statisics
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