If you want to filter some dirty words during the chatting process, just input them in the textbox near the Add button. Click the Add button and click the Save button to save your settings. Next time, when this word appear on the chatting window, it will be replace with the form that you set in the filter form textbox, such as "*", "#",or other forms. At last, don't forget to click the Save button.
Note: After you finishing setting the relevant configurations, please click the Submit button to save your settings made just now.