This is simple strategy of trading using Moving average
Add an exponential moving average to the chart, set its period to 9, apply to Close, set color to red (optional) #this is your fast moving average (FMA).
Add another exponential moving average to the chart, set its period to 14, apply to Close, set color to blue (optional) 
#this is your slow moving average (SMA)
Use the same condition of buy to sell but in the oposit.