How did Tik Tok find the source of information sent by others?

Tik Tok, the source of information sent by others is to view the home page of location information. Open Tik Tok. After opening it, go to Tik Tok's homepage and see the text at the bottom. The second one on the right has an information option. Click the message option at the bottom. Select the avatar, enter the message interface, and click the avatar of the sender.