MetaTrader 4 MetaEditor Language: How to Add EAs
The Meta-Editor language Editor is a coding environment on the MetaTrader 4 stock indices software which traders can use to add new Expert Advisors, Custom Indicators, Scripts, Libraries and Include Files which are used in programming/coding automated programs.
The MetaTrader 4 MetaEditor is shown below and traders can get it from the Tools menu on the MetaTrader 4 platform. This Meta-Editor is popular with the Stock Index traders who use Expert Advisors to trade indices. If you are a Trader Looking for EA Robots, then you as a stock index trader can find them on the MetaTrader 4 Expert Advisors Library.

Open Meta Editor on MT4 Platform Software
MetaEditor

After Adding a new MT4 Expert Advisor, a stock indices trader will be required to compile this new added item so that it can now be recognized by the MT4 platform & for this new item to begin to appear on the listing of available EAs.
Adding a New Indices Automated Expert Advisor
Once you've opened the MetaEditor Work Space as pictured above, Short Cut key board Keys - Press F4, then follow the steps explained below to add your new MetaTrader 4 Automated Expert Advisor.
Step1: Go To File Menu, Select and Choose "New"

Adding New Custom EA(Expert Advisor) in MT4 Platform Software
Step2: On Pop up panel which appears choose 'Expert Advisor' and click next like shown and illustrated below

Adding MT4 Expert Advisor in MT4 Meta Editor
Step3: Enter Name of Automated EA as Highlighted Below & Click Finish

Creating a New MT4 Expert Advisor in MetaTrader 4 Platform
The Following Code will Popup

Adding Expert Advisors on MT4 Platform
To Code this Automated EA, it requires that you are a coder who knows C plus plus Object Oriented Coding Language, That is the Programming Language that forms the MQL4 Expert Advisor Programming Language that's used to Program the MT4 platform and also the Expert Advisor Robots that trade on this platform. Or you as a stock indices trader can find the forum of MQL4 Programmers and they can code the EA robot for You. Or you as a stock indices trader can find a tutorial for programming and Learn, or you as a Stock Index trader can go to MQL5.com CodeBase Library of Automated Robots & buy an already programmed Expert Advisor if you want to start automated trading.
Step4: Compile the Expert Advisor Program
Don't forget to compile the Expert Advisor, for the Expert Advisor to be recognized by the MetaTrader 4 trading platform software: one must compile the program, then close the MT4 software & restart it, just like restarting your computer you'll restart you MT4 platform software & your new EA will then be Listed on the MT4 Expert Advisor List within the MetaTrader 4 platform Navigator Window.

Adding & Compiling a New Automated EA on the MT4
If your Expert Advisor has no Programming Errors, it will be Compiled successfully without any compilation error as shown and illustrated below.

Automated Expert Advisor Added to MetaTrader 4 After Compilation
Step5: Rebegin MetaTrader & the new EA bot should now be listed on the available Expert Advisor List on MT4 Navigation Menu like shown below, ready for beginning trading with.

Stock Expert Advisor(EA) Added to Software MT4
How to Place a Downloaded Automated Expert Advisor
If you download a automated bot from a source on the inter-net, for examples from www.tradestockindices.com, then it's now in your desktop computer PC, to add it, follow the steps described below:
Step1 : On File Menu of the Meta Editor, Select and Choose "Open"

How to Place a Downloaded Expert Advisor to MetaTrader 4
Step2: Find Download Folder from the Pop up window which appears like is illustrated and shown below

Adding a Downloaded EA Robot to MT4
Step3: Once you as a trader Open the EA it will be displayed on MT4 MetaEditor and then follow the above guide for compiling the EA, once it is compiled without errors, Restart Your MT4 Software and The automated bot will now be added and you as a stock index trader can use start & begin to trade with it in your MetaTrader 4 Software.
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