Here’s a rewritten version of the sentences with question words added before the infinitives:

1. She wondered how to tell that news to her parents.
2. I have no idea where to learn emotion control skills.
3. I haven't decided which bus to get on.
4. We are talking about how to cope with teen pressure.
5. The students can’t decide when to take optional subjects.
6. You need to remember when to turn off the computer.
7. The notice board didn’t specify whom to contact.
8. The students couldn’t decide where to go for a cup of coffee after class.
9. They didn’t know when to meet to discuss their plan for the wildlife protection project.
10. He asked where to find more information about this.