Hey there @Aquagremlin, welcome to the Discourse! If you follow the steps posted over in the linked thread, post 45 (the yellow one) should explain how to upload your template. In short, you will need to zip the json file before uploading
http://discourse.stonehearth.net/t/the-buildings-my-hearthling-will-not-build-thread/14704/45?u=jomaxro&source_topic_id=18665