If you are getting the error "Unknown Function bf_com_bftag_AdminHandler" then there is one of two things wrong.
1) The Blue Flame xAJAX System Mambot is not published - Simply publish it if this is the case
2) You have not uninstalled the OLD Tags component Mambot tag.php
Look at the error message - can you see anywhere "tag.php" ? If so then you have not removed the old tags component mambot and that is causing issues - Please go to the Site Mamabots Manager in Joomla Admin and select "tags" mambot and delete it. Make sure this deletes the file at /mambots/content/tag.php
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