How to Trade Using ADX

One way to trade using ADX is to wait for breakouts first before deciding to go long or short. ADX can be used as confirmation whether the pair could possibly continue in its current trend or not.
Another way is to combine ADX with another indicator, particularly one that identifies whether the pair is headed downwards or upwards.
ADX can also be used to determine when one should close a trade early.
For instance, when ADX starts to slide below 50, it indicates that the current trend is losing steam. From then, the pair could possibly move sideways, so you might want to lock in those pips before that happens.