Here is a plugin for it ---> http://community.mybb.com/thread-158367.html
and here is another similiar plugin --->http://community.mybb.com/thread-157946.html
MyBB Support
[Help] Text Editor Not Show
Submitted by Tempe, 12-12-2015, 11:46 AM, Thread ID: 15153
Thread Closed
RE: [Help] Text Editor Not Show 12-12-2015, 12:17 PM This post was last modified: 12-12-2015, 12:18 PM by Deleted_3747 #2
12-12-2015, 12:17 PM
#2 This post was last modified: 12-12-2015, 12:18 PM by Deleted_3747