i need help for my quest and cannot chat with people around me cause doesnt know the function to chat or say something can anyone help
I don't quite understand the question. Do you mean how to talk to PC's around you? Your default chat setting should be on "say" so that shouldn't be a problem. If you mean talking to an NPC, you should be able to 'double click' them and they'll talk to you.
There is information on Lodestone (the official site) under Play Guide --> Playing with Others ---> Means of Communication.