Tap&Go Video:
https://www.youtube.com/watch?v=vDjVTZ4A1So
Octopus Video:
https://www.youtube.com/watch?v=mBzu9Lhl5DM
(No clue why I thought you have to upgrade or do something to your card BEFORE hand to upgrade the stored value limit to $3000 on your octopus card. I did this at one of the automated kiosks at the MTR station)