First, open and visit the OpenAI website or search ChatGPT. Second, log in or create an account to access ChatGPT. Next, click the + icon to select and upload your image into ChatGPT. Once done, click the three dots button and select the "Create image" button. Last, type in your prompt, such as "convert this image to a Studio Ghibli-style illustration, maintaining the original colors and background details." Then, hit Enter and wait for ChatGPT to process the request and generate the Ghibli-style image.