Touch pad mouse click – always get a “right click” menu. How do I “left click?”

I am normally a Mac user, but bought a Lenovo IdeaPad yesterday to use for volunteer work at a non-profit organization. I am used to a touchpad, but when I single click, I am getting a pop-up menu, as if I “right clicked.” I am finding this very frustrating and would love it if someone could give me a simple answer (as I do not speak Computer.) Thank you!