Laptop Questions? Ask a Laptop Technician for Answers ASAP!
Hi! My name is Ameen and I'll be assisting you. Secure Remote Assistance is NOT REQUIRED (But Helpful)
I am sorry you are having this concern, I will do my best to help you today.
To answer your question ->
The buttons are Fn-F4 or Fn-F1
Another option is to use the control panel steps from this link - https://support.hp.com/sg-en/document/c00471015
Let me know if you have any follow up questions. I am here to help you.