How to make Kunena Read Only
If you have phpMyAdmin open it. And then open the database, where the database tables of your Kunena Forum installation are.
Click on the left side on jos_fb_categories.
ON the right side above click on SQL and you will see a input textfield, where you can insert code. Delete the existing code in this Textfield
Update `jos_fb_categories`
SET `locked`= 1
and click on OK.
This will lock all forums and categories.
To unlock all again insert this:
Update `jos_fb_categories`
SET `locked`= 0