Hello,

To zoom in and out, you can use the mouse wheel.
Alternatively if you work with a laptop, you can also use the multi-touch trackpad (e.g. 2 fingers slide up or down on a macbook).

To rotate the model use the left button of the mouse (or trackpad).
To pan the model use the right button of the mouse (or trackpad).

Hope it does solve your issue. If it doesn't, could you let me know you computer configuration/browser so that I can have a look at that?

Regards

i am on a acer chrome book. what button do i use to zoom in and the button to zoom out? i want to know how because i am building something big. i mean BIG.

It is very easy to zoom in or zoom out screen by using a wheel of a mouse or you can use the zoom options from bar icon. The https://www.superiorpapers.com/ is one of my favorite sources to learn new about the trackpad and I think you should follow these instructions.