Click here to read the XDA Developers page from which the the following brief extracts have been taken.
Click here to go straight to the sub-topic in the above article that contains a table of useful actions that are well worth noting.
In case you didn't know you can still use a traditional external mouse with your Chromebook. Both wired [via USB] or the wireless kind are supported.
You can invoke the right click action menu by simply clicking on the button on the right side of the mouse (hence the name ‘right click’).
When you use an external mouse absolutely nothing changes with right click options menu so you are completely at home.
Most people's first thought when they're looking to right-click is to use the touchpad. Unlike a traditional PC, there isn't a separate button on the left and right of the touchpad for right and left-click, respectively. There is only the ability to do a click, and the type of click is determined by the number of fingers you use when making the click. A single finger tap on the touchpad will yield a traditional left-click function. To right-click, instead, tap the touchpad with two fingers to get the desired result. You can tap anywhere on the touchpad with two fingers to right-click. You don't need to do so on the right side.
Not only can you use the touchpad with two fingers, but you can allow right-click functionality using the keyboard as well. To do so, hold the Alt key (located on either side of the spacebar) while tapping the touchpad with a single finger. Again, you do not need to tap a certain part of the touchpad. You can tap anywhere.