What does this mean Zignaly 'powered by binance'?
Zignaly has teamed up with Binance as a part of its Binance Broker Partner Program:
Binance Launches Broker Partner Program
This means if you prefer not to create a Binance account you won't have too, Zignaly will create one for you (behind the scenes).
It is the fastest way to get started, as well as easy to manage all of your trading needs directly from Zignaly.