What are the Alert and GTC buttons?

These are diagonal alert lines. Select Alert and the line is good for the day. Select GTC and the line is good until it is triggered. To draw an upward sloping line click on the lower half of the starting candle and the lower half of the end candle. The line will be drawn and when triggered you will get an alert pop-up. To draw a horizontal alert line, click on the same candle twice. These lines are great for trade entry and for managing your exits.