Renaming Tik Tok is super easy for me, who brushes Tik Tok every day. Let me demonstrate:

Tik Tok version for step demonstration: version 22.6.0.

1. After opening Tik Tok, click "I" in the lower right corner, and then find and click the location of "+Add location, school and other labels", as shown below:

2. After coming in, click "Name".

3. Enter a new name in the input box, and then click "Save" in the upper right corner.