There may be some tutorials that I'm unaware of but it's pretty easy to use. Just look at the actions and most are self explanatory. It uses the HTML5 canvas so you could google tutorials for that and it's mostly a one to one with this plugin.
There's an action to do a flood fill and erasing is done by pasting an object with the destination out blend mode.
Replaying should just be a matter of making a list of the actions you used as you use them. Then just make some events to loop over the list and does what was saved. You probably could use an array to do the list.
Thanks! Now that I've played a bit more I feel more confident.
Regarding the replay of drawing - I'm a bit stuck. To clarify, I would like a student to be able to draw in the app (i.e. trace a word) and then click the 'replay' button and it will replay exactly what they just drew.
Is that possible?