1. Open the Tik Tok application, click the button in the upper right corner, and then select "Settings".
2. In the settings menu, find and select Privacy Settings.
3. On the Privacy Settings page, select the Private Message option.
4. In the private message settings, slide to open the "smart mask" function, and then click to select "custom mask words".
5. Click "Add a mask word", enter the keyword you want to mask in the pop-up prompt box, and then click "OK".
6. After completing these steps, the blocked keywords will not be seen by other users through private messages.