Add functions to existing Mql4 code : 50 sma

I have a full working mt4 ea (attached).

I just need a 50 simple moving average added.

I need to be able to turn this on or off and change it to 100 or 200 or 50 ,20

The simple moving average line needs to show on the chart when the ea is active

By adding the 50 sma, The ea will only trade BUY when candles are above line and ea will only SELL trade when candles are below 50 ma line.

This has to work with the stochastic indicator crossover line rules that are already. in the ea..

how it must work: The stochastic settings are 14, 6,6 When the blue line crosses below the red line and if the candles are below the 50 sma a sell trade is placed.

When the blue line crosses above the red line and if the candles are above the 50 sma a buy trade is placed.

any questions ask The ea will need to be tested and working correctly before payment is released. full open code need to be given to me and remains my code after payment and cannot be resold