Touchpad Doesn't Respond

I just got this laptop Tuesday, and the touchpad stopped responding Thursday. I haven't yet been able to go through the tutorials so I am still shaky on navigating around the laptop. I can get to the help pages with the tab button but cannot move within the pages. I found a YouTube video showing how to turn the touchpad on/off but that button located on the F5 key produces no results. I turned the speaker volume way down before I lost the touchpad and cannot figure how to turn it up without the touchpad. I need this to work asap!! I am hoping it is a combo of keystrokes and desperately need help!! Thank You!