Comment to Converting HTML editor to text editor
In comments it need to be changed in different place, for example to enable plain editor in Discussions comments run the following query:
UPDATE `sys_objects_cmts` SET `Html` = '0' WHERE `Name` = 'bx_forum';
Sorry, but didn't know where to add this query exactly! in which file?
You need to login to your host and open up phpMyAdmin and click on the database to your site and then click on SQL tab, then paste that command into the box on line 1 (remove what may be there on line 1 already) and execute that command by clicking GO