Use "Indicator tester" when you add a new custom indicator.
The first thing is, look at the error messages to make sure that the indicator is loaded without problems, it should also automatically appear after the backtest (indicators does not appear in live test).
Then, look at the values produced by "Indicator tester". Where the indictor is not visible, the value should be... something giant, or 0 in some cases. If you have the same value all the time, whatever it is, then this buffer cannot be used. If this is the case, try with Candle ID = 1 (this is for indicators that draw arrows). Of course, make it run for more than few candles.
For multi-timeframe indicators, try different timeframes.
