To add a new source on the General tab, select Add => Sources.
Then the window for selecting data sources appears.
Source settings can be changed in the Properties panel, which is located on the right side.
At the moment, S#.Data supports the following sources:
Blackwood(Fusion) - trading platform.
FinViz - web service of historical data.
Google - web service of historical data.
Interactive Brokers - trading platform (and broker).
IQFeed - market-data feed.
OpenECry - trading platform (and broker).
Quandl - web service of historical data.
Rithmic - trading platform.
Sterling - trading platform.
Yahoo Finance - web service of historical data.
ITCH - DMA for the LSE and NASDAQ.
BarChart - market-data feed.
CQG COM - trading platform.
CQG Continuum - trading platform.
Xignite - market-data feed.
Crypto currency (bitcoins):