Hi Kenneth. Welcome to the forum. I just sent some dart frogs to someone in your city last week. Small world eh?
Breeding Milk Frogs is all about conditioning and then cycling them. Feed them well, then try to keep them on the dry side for a month or two (still mist, just much less frequently).
In the meantime try to set up a rain chamber. Something as simple as a lidded aquarium with a gravel substrate and a section free of gravel to so that you can put a water pump in it. Run the water up to the "ceiling" of the tank and put some holes in the tube up there so that you can mimic a rain effect. Saturate the substrate with water, but don't let it go above the main gravel section so that the frogs don't have to worry about falling into a large pond. You will need branches and other climbing materials for the frogs to hang out on.
Sometimes Milk Frogs will lay their eggs in shallow water, but often they will prefer to use a laying box. Some kind of plastic box that has a hole in the top for the frogs to enter and leave, but also has an inch or two of water in the bottom is ideal. Make sure the box is not see-through. Think "tree hole".
When you think the frogs are ready, move them to the rain chamber and start it up. It could take a week before they exhibit any significant breeding behavior but usually it's a lot sooner than that. This doesn't always work on the first try, so you may need to try it more than once - cycle them back dry for a couple of months and then try the rain chamber again.
If you can get hold of a copy of the April 2011 Reptiles Magazine, I've got an article about this in that issue.
Best of luck,
John