You need to use the My Devices tab in the IDE and add a device using the “+ New Device” button in the upper right. You then need to fill out all of the required fields. The Type field is where you choose the new Device Type that you added. The Device Network Id can be anything as long it’s unique and not already listed under your existing devices. Also, be sure to choose a hub in the Hub field.
After adding it in IDE, it should show up under My Home -> Things in the SmartThings app.
