If you have a custom indicator and a strategy for buy and sell this video will show you how to add buy and sell arrows to your custom indicator for both MT4 and MT5.
The video uses a tripple moving average ribbon from earlier tutorials as the basis and adds buy and sell arrows to the indicator. To see the earlier videos for a full explanation of the MT4 and MT5 ribbon indicator follow the links below.
MT4 Step by Step Custom Indicator
MT5 Step by Step Custom Indicator
The video also shows a technique to overcome a problem where arrows on the MT4 chart will overlap the top and bottom of the candles.