How to add custom indicator to functioning expert advisor

 

Question: How do I get my already functioning expert advisor to check multiple indicator readings before entering trade?

For example: (1) how do i get a MA crossover EA to also verify predefined macd reading and also predefined stochastic reading before continuing with opening buy or sell order at market, from current chart or predefined time frame? further can i incorporate multiple custom indicators into existing EA? thank you gentlemen in advance..

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