Assuming the word censor is enabled.
ACP Main page >> Board Features link on the left >> Make sure "Allow disabling of word censoring:" is set to yes.
This is also group permission that can be enabled or disabled for individual groups :
ACP >> Permissions Tab>> Groups Permission link on left under Global Permissions
Make sure each group has the permission "Can disable word censors" set to yes.
“Results! Why, man, I have gotten a lot of results! I have found several thousand things that won’t work.”
Attributed - Thomas Edison