1. Open the Tik Tok application: First, make sure that you are logged into your Tik Tok account and open the Tik Tok application.

2. Enter the observation account: in the navigation bar at the bottom of Tik Tok homepage or page, find the related options such as "observation" or "hot treasure observation", and click to enter the observation account interface.

3. Setting message reminder: In the account observation interface, there will usually be an icon of settings or personal data. Click it to enter the account setting page. In the settings page, you can find options for message notification or reminder.

4. Turn on message notification: In the message notification or reminder option, you can turn on the notification of receiving messages. At ordinary times, you can choose to turn on the sound, vibration or pop-up notification, so as to receive the reminder in time when there is new news.

5. Confirm Settings: After completing the above settings, make sure to save or confirm your selection. In this way, when someone sends a message to your observation account, you will be notified accordingly.