1. Launch a machine and choose “Medium” or “CPU” if you just want to test out the workflow.
2. Once you see the ComfyUI interface, please drag that workflow json from your local drive into the ComfyUI interface.
3. Set it up with ComfyUI manager to install missing nodes.
4. Use model downloader to download necessary models.
5. Queue Prompt and find your output in the file browser on the right, ComfyUI/output folder
6. Stop the machine, but do remember to Cloud Save this workflow for future use.
7. “Share” button will give you a private URL to this workflow, you can share that with anyone so they don’t have to do step 2/3/4 on their own.

Extended reading, How to run workflow (launch a machine) in RunComfy?