Either go to Module (at the top of the editor window) and click on Trigger Editor -OR- hit F4 on your keyboard.
That will open up your trigger editor.
Map Initialization will have all the trigger commands for Melee (as noted above).
What the editor is telling you is that your game is not longer considered a Melee Map because you used X, Y and Z. It does not remove the Melee Triggers.
Melee Game - Use melee time of day (for all players): I believe sets the time of day to early morning to mid-day.
Melee Game - Limit Heroes to 1 per Hero-type (for all players): Limits the creation of one hero type for each player, one Paladin, one Mage, one Mountain King and one Blood mage.
Melee Game - Give trained Heroes a Scroll of Town Portal (for all players): As it says, it gives a scroll of town portal to the heroes.
Melee Game - Set starting resources (for all players): Gives the players their starting Gold and Lumber = 500 Gold and 150 Lumber.
Melee Game - Remove creeps and critters from used start locations (for all players): This is used to remove creeps and critters that are at start locations that are used by players. This makes the assumption that one is using several player positions however only 1 or 2 or a few players will play. It also assumes that you have placed neutral hostile and neutral passive units at or near the gold mines where you should have a player start location placed.
Melee Game - Create starting units (for all players): Creates one starting base: For humans that would be a town hall and 5 peasants. For Orcs that would be 1 great hall and 5 peons. Etcetera and so forth for the rest of the races.
Melee Game - Run melee AI scripts (for computer players): This is the program that runs the behaviors of the computer players with the melee units only. If you open up the Tool Pallet for units you find that there are three main categories: Melee, Campaign and Custom - the Melee AI (Artificial Intelligence) uses the units in the Melee part of the Tool Pallet only. It is designed for a melee type game - however you can use it as a powerful tool to run an enemy or ally team if you limit the units available to the computer player.
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Player Limits
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Events
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Conditions
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Actions
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Player - Make Gryphon Aviary Unavailable for training/construction by Player 1 (Red)
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Player - Limit training of Footman to 6 for Player 1 (Red)
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Player - Limit training of Heroes to 1 for Player 1 (Red)
These limits would not allow player red to make the Gryphon Aviary - thus no flying units. It also limits the training of 6 footmen - This doesn't mean that player red only gets 6 footmen - it means that player red can only have 6 footmen at any given time on the map. If one or more dies player red can train new ones to replace the dead ones. Used in conjunction with the melee AI you can have a small attack force that is ran by the computer in say an RPG single player one hero map.
Melee Game - Enforce victory/defeat conditions (for all players): This one sets the defeat/victory condition. That condition is either no units by an enemy player on the map - in which case the other player wins. And it also sends out the warning about Your needing a keep, great hall what ever or you will be revealed in X amount of time.