Compress the mod using winzip or your favorite file compression program.
While logged in at Undertow, click on the word 'Resources' near the top of your screen. This takes you to the Resources (upload/download) section of Undertow.
In the Resources screen, click on the blue button that says "Add Resource" (It's on the upper right of your screen).
A pop up will appear. Scroll down until you see the word "Dialogues" Click on it.
You should be able to figure out the rest.
Thanks for uploading.
Very respectfully,
fleet (global moderator)