How do I zoom in and out using the ALT on my laptop?

As far as I know there isn't really any way. You really should invest in mouse. You can get a decent one on amazon for $15. https://www.amazon.com/Redragon-CENTROPHORUS-2000-Gaming-Buttons-Weight/dp/B00HTK1NCS/ref=sr_1_2?ie=UTF8&qid=1470531668&sr=8-2&keywords=mouse https://www.amazon.com/AmazonBasics-3-Button-Wired-Mouse-Black/dp/B005EJH6RW/ref=sr_1_1?ie=UTF8&qid=1470531716&sr=8-1&keywords=mouse

Actually there is a way. File - User Preferences - Input - Emulate 3 Button Mouse. Mess around and you should be able to figure it out.

Thank you! I ended up using the + and - key on the number pad to zoom in and out.

On a Mac Book Pro, pinch to zoom works