To get an API key for ChatGPT, you can follow these steps:
1. Visit the OpenAI website – https://beta.openai.com/signup/
2. Sign up and log in to your OpenAI account.
3. Go to the API section of the website.
4. Here, you will be able to find the option to generate your API key.
Please note that using the OpenAI ChatGPT API is not free and it comes with costs that depend on usage. Ensure that you review the Pricing before you decide to generate the API key.