Hi,
MT4 newbie here! I’ve inserted the MACD indicator into my chart in MT4, but it only shows the slow moving average line and the histogram. How can I add the fast moving average line? The period numbers are (12,26,9). Thanks! 
Hello Mr. President,
I wish you were back in office, those were some good times. I would like to present to you the answer to your problem. Use the link below.
Put this file in C:/ProgramFiles/YourMT4Program/experts/indicators
Close MT4 and re-open. Look in custom indicators for MACDCustom
You will have to edit the colors and stuff. The lines are by default black and do not show up against a black background.
This is not my work and I do not know who to credit as the original author.
Enjoy.
Dear mytwopips:
Thank you for your comment. Yes, our fine country was a much better place to live in when I was in office. 
I’ve resorted to making extra income by trading pips to support myself in this inflated economy.
BTW, thank you for the instructions. 