Publish an offering: New Post → I have a GPU → set total hours in the pool, your rate, how buyers should access the machine (SSH, Docker, Jupyter, or other), and attach scanned specs. A public escrow goes live with the listing; buyers join for a slice of the pool. Or reply to a buyer: open a Need GPU post, attach your registered GPU, and offer hours and price. That attaches a contract invitation on your reply for the buyer to accept.