Ok this is a question I can answer.
In your shard, type [add moongate and target the place you want to place the gate. Then [props it. It will have a menu like below (see pic). Change "target" to the coordinates of the place you want the moongate to take you.Change "targetmap" to the facet: Trammel, Malas, etc.
Then you can also change the hue in that menu too to change the color of the moongate. Change "name" to what you want the moongate to be called. For example, you might want to change it to "Britain" if the moongate leads to Britain. Finally, to find the coordinates of where you want to go, go to that place and type [where to get the coordinates, then go back and plug them into the moongate.
Any questions?