To practice forex trading, you must first make sure to have conquered knowledge of trading platforms, glossary, and how to read the market.
After that, you can move on to deeper things such as knowing forex risk, how to manage it, choosing a trading strategy that suits your style, and trading psychology. For that to happen, you can gain knowledge from various sources on the Internet or join trading forums or communities so you can discuss with fellow traders.
Apply your strategy diligently, patiently, and with self-discipline. More importantly, you have to set a target for how long you will practice on a demo account before moving on to the real account.