How to use DataFeed app | Dữ liệu chứng khoán

to turn on/ off support/ resistance levels, go to Settings, choose "Support/ Resistance/ Trendlines" indicator (only available to Premium users)
to run backtest mode, pls first select timeframe from m15, backtest mode does not support timeframe smaller than m15, then tap and hold on chart window to open context menu, then select "Enter backtest mode". You can change backtest simulation speed by touching chart window, then adjust speed using slider. To exit backtest mode, tap-and-hold for context menu, then choose "Exit backtest mode" (only available to Premium users)
to use Trade signals, choose "Trade Signals" menu, pls get a look at this article
to use custom alerts, choose menu "Notification" in mobile app, see details
to see Vietnam market daily insights, choose "VN Analytics" menu, see details
DataFeed has desktop app (Windows, Mac OS). Download desktop app from DataFeed website and install, then use mobile app to authenticate desktop app by choosing "Desktop App" menu and scan QR code of desktop app
Four features above are available to all users, but with some limitations for non-premium users.