View the video via the most recent YouTube app (iOS | Android) on your mobile device.
Move the device around to navigate the 360-space.
An Android device will also provide the opportunity to place your phone/tablet into a Google Cardboard or Samsung Gear VR head mounted display simply by clicking on the headset icon in YouTube.
Make sure to use the Chrome or Firefox web browser on YouTube. Not available on Safari or others.
Click and drag or use your mouse to click the arrows and move around the 360 space.