Can you give us some specifics? Like are you talking about a command OOC chat, i.e. /o or just the normal chat, i.e. T > type chat > enter?
If you have a command, you'll find it somewhere in your script. Try and search for the following with CTRL + F:
Код:
• CMD:o
• dcmd_o
• YCMD:o
• "o"
• COMMAND:o
These vary depending on the command processor you're using.
If you find any of these, just simply remove the code to do with it.
Otherwise, if it's the normal chat, then the callback is OnPlayerText(playerid, text[]) that you'll need to find and modify to fit your requirements.