Here is the link. http://192.168.0.1/webpages/login.html or 192.168.100.1
This video explains on How to step by step set up your Flash Internet, and activate it.
Key Notes, when trying to activate the internet, make sure that you don't use data but instead connect to the TP-Link wifi instead. Also make sure that your device is nearby the router.
Timestamps:
0:00 Intro
0:16 Devices
1:36 Setting Up the Devices
5:47 Activating Your Internet
8:49 Outro