For more specific instructions, could you provide details about the platform you're using (Windows, macOS, Linux, etc.) and where you obtained the game?
Neatopotato Novels Full is likely a visual novel or a game, and I'll assume you're looking for installation instructions.
Get Ahead on Your Study Prep This Cyber Monday! Save 35% on all CFA® and FRM® Unlimited Packages. Use code CYBERMONDAY at checkout. Offer ends Dec 1st.