[GNC] Price Editor Problems

[DaveW]

Where, please, can I get wo-to-go instructions to get my stock Price
Editor (Re)working??

I am running Ubuntu 18.04.  GNC ver 3.5.  My stock is all on the ASX
(Australia).  Things worked wonderfully until the Yahoo demise and
then for a while I was able to use Alphvantage but that stopped too. 

I have tried all sorts of fixes randomly and fear I have completely
confused GNC in the process.

I would greatly appreciate some step by step assistance.

Dave W