Tap your PlayStore icon and go to the Store.
Type "Metatrader 4" in the store search field, the store will find the Metatrader 4 android application for you.
Click on search results and you will see the app window like this.
Click on the Install button and then on the accept and download button to start downloading the application.
If you have done everything right so far, you will see a screen like this.
After your Metatrader 4 for Android is installed onto your device you can open a new account or login with your existing account
Type "octafx" into the server search bar and, after the servers are found, select live or demo server (real - for real account, demo - for demo accounts).
Enter your MT4 login and password to login to your account
If you are doing everything right, you will be logged into your account. From here you can enjoy Metatrader 4 trading app on your Android-driven device!