How to add custom indicators or Expert Advisors to MT4/MT5?

To add an Expert Advisor or a custom indicator, open the MT4 platform and go to File – Open Data Folder, then select MQL4/5 – Expert advisors or Indicators and copy the indicator (Expert Advisor) file in MQL4/EX4 or MQL5/EX5 format to this folder. After you restart the platform, your custom advisor/indicator will be displayed in the “Navigator” window. You can drag it to any chart with your mouse.