Click the "three horizontal" menu key of the remote control, and click the down key to enter the child lock settings. After you finish the math problem, you can choose to lock the screen regularly. The specific steps are as follows:

1. After entering the animation channel, click the "three horizontal" menu key of the remote control, and then click the down key to enter the child lock settings.

2. After entering the settings, parents need to complete the corresponding math problems.

3. After finishing the math problem, you can choose to lock the screen regularly, for example, you can choose 30 minutes.

4. Secondly, after the child watches the animation for 30 minutes, the screen automatically locks, prompting the child to rest.

Then, if you want to unlock the child, you can open it again.

6. Finally, parents can look at the math problem again.