Tik Tok can't change his id in the live broadcast room, only on his personal homepage.

Tik Tok ID card change method: 1. First, we click on the three points in the upper right corner of the personal work page; 2. After this dialog box pops up, we click the option of editing data; 3. Then, here, look at where our Tik Tok is, and click on this Tik Tok; 4. Then we first remove the original number, enter a new number, and then click Save; 5. Then when we come out, we can see that our Tik Tok has changed; 6. After we changed once, we came in again. We can't click here, and we can't change it.