In Tik Tok Live Studio, the host usually uses special live tools or applications to add text, icons, stickers and special effects to the screen. These tools usually provide the function of adding interactive elements and comments in the live broadcast, and one of the common functions is to add text on the screen. Specifically, the words circled in red are usually added in the following ways:

Live broadcast tools: The anchor uses special live broadcast tools or applications, such as OBS (Open Source Broadcasting Software) or the built-in tools provided by Tik Tok, for live broadcast and content control on the screen. These tools generally have the function of adding text, and the anchor can click on the screen to enter text.

Text input: After the anchor chooses to add text elements to the screen, he usually chooses the color, font, size and position of the text. Then, they can enter the required text content in a specific position on the screen.

Dynamic effects: Some live broadcast tools allow anchors to add dynamic effects, such as animated text or subtitle effects, to make the text more attractive.

Interactivity: The anchor can use these tools to interact with the audience during the live broadcast, such as answering questions, calling the audience's name or providing special news.

It should be pointed out that for live broadcast tools and applications, the specific ways of adding text may be different. If you are a live audience of Tik Tok and want to add text or learn more information, you can check the documentation of Tik Tok live application or ask the specific anchor. If you are an anchor, you can use the built-in function of the live broadcast tool to add text elements.