Day three: Find a video on YouTube about agile testing, then watch it!
I can't lie, it's been a long day and I've just picked the first hit for "agile testing" on YouTube.
It's a pretty elementary but good overview of how testers add value in an agile environment, compared to the older waterfall model.
It's by a group called QASymphony, who seem to be selling a particular test case management tool.
Their YouTube channel seems legit though, there's a lot of videos that look interesting (although, sadly, no followup to the above one, as far as I can tell)