As a long time TF2 player I had no idea what you were asking.
What the title says: [TF2][REQ] Enable MYM features on your own server
What does that mean? After searching the internet I found that MYM may be the 'Meet Your Match' update where the 'PASS Time' game mode was introduced. Link: http://www.teamfortress.com/meetyourmatch/
Are you wanting to know how to play PASS Time on your server? It's also where 4 new taunts were introduced. Are you wanting to use the taunts?
What 'features' or 'command' are you looking for?