@Loradim is adrift in an ocean of options:

[...snip...] but I can't find where to turn Canvas selectable mode on.....

There are three buttons in the lower left leading corner of the canvas.

One is the traditional Play button which allows the canvas to be Live.
Live means sliders slide, toggles tog, and buttons butt.

The second looks like a wee mouse arrow. This is Play button's sister, Selectable. The third button, Variants, isn't part of this tutorial.

If you're keen to code like @twoStraws and have the graphical view selected when you click view code you'll need to first change options. Cool trick: if you select the object in the canvas, it will highlight the code in the editor. Sweet Irn Bru, that's nice.

Keep Coding!

Speaking of oceans, in the English phrase Pacific Ocean, all three Cs are pronouced differently. You just tried it, didn't you?