Let me take the latest version of Tik Tok 22.7.0 as an example.
1. Open Tik Tok and click the plus sign at the bottom (as shown in the figure below):
2. Then click "Album" in the lower right corner (as shown below):
3. Select a video (as shown below):
4. Set video music, special effects and other functions, and then click Next (as shown in the figure below):
5. Write down what you want to say in the position of "Add Description of Work" above (as shown below):
6. You can see that the text we wrote appears under our Tik Tok (as shown below):