This is what I have done and it works for me.
Take the 2 files in the components/com_comprofiler/plugin/user/plug_cbsimpleboardtab and change all references of fireboard to kunena. (searc and replace).
I am attaching the 2 files, backup old files and copy in the 2 unzipped files.
Good luck
Stephan
Attachment plug_cbsimpleboardtab-5cae471279ea5d405d3cdf717d5a951a.zip not found
By this way... there is a CSS failure since a long time in this plugin...
This div at the beginning set the class to sectiontableheader, but the div close after the complete table. So in my CB tabs everything is formated as tableheader and looks terrible.