Making a unit use a custom ability through triggers?

ok, how do i make this happen. i want the unit to cast my custom ability trough triggers, but how do i trigger it?

Simple.

When you create your custom spell, scroll down until you see the command options. They should be listed as "Activate," "Deactivate," "Use/Turn On," and a fourth one I can't remember off the top of my head. Look at the Use/Turn On option and write down the command located there letter by letter.

Now, go into your trigger editor and create a new Action. Scroll down the action list until you see the commands "Unit - Issue order to unit." There will be "targeting a point," "targeting a unit," "with no target," and so on. Choose the one appropriate to your needs.

Set the unit and point fields to their approprate aspects and then go under the actual order field. You'll see a scroll bar with various choices for the order you wish to give. Choose the one that best fits the command you had written down. For example, if the command was "silence," you'd select "Neutral Dark Ranger - Silence'

If you did everything right, this should work perfectly well.

Doesn't always work... add a trigger that displays the issued order, whenever an order is issued by (whatever play you want)

like the infernal spell is like DreadlordInfernal instead of just Infernal, as it says on the strings On/Off

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