You can set to restrict children from running chat tools here.

You can select a chat tool in the chat tool list to decide whether to allow it to run.

The time table includes 7 rows and 48 columns, each row represents a certain day of the week, and each column represents half an hour. Each cell of the table contains a small button. You can click these small buttons to switch their status. When the button is gray, it means that children are not allowed to chat online during this period; when the button is blue, it means that children are allowed to chat online during this period.