How to place buy and sell icons at specific candle instead default buy and sell icons at current candle

[parshu]

I have written a simple Expert Advisor program. When the trading logic condition is met the Expert Advisor gives the signal at current forming candle by default.

So, can anyone suggest a way to place buy and sell icons at a specific candle(e.g. with candle indexing like at 20th candle) instead of getting them at current candle by default?.

Thanks in advance.