Is it a must to use indicators to trade Forex?

The answer is NO! If you are not an expert, sometimes you would even get confused by the signals generated from the indicators, I have seen tons of beginner traders that love to use multiple indicators in their charts. This is totally not recommended.

You must remember indicators are lagging, they only move once the price has finished its move, it is always behind the price. It is better if you learn up price action so you do not have to rely on indicators.

This doesnt mean that indicators are totally useless, you can use them as extra confirmation for your entries but do not use them for signals.