Router - APP

What is the password rule for Dynalink account?
Do I need to register Dynalink account to use Dynalink WiFi?
What is the difference between Dynalink APP and WebGUI?
Can I use Dynalink APP to configure Router when Internet connection is down?
Can I use one Dynalink Account to manage two Dynalink WiFi products?
What is DL-WME38 on the Dynalink APP model selection?
When setting up the Router for the first time, why the APP keep showing the router has no Internet connection and cannot move on?
My mobile phone is already connected to Dynalink Router, why Dynalink APP said it cannot find Dynalink Router?