First, you need to log in to your OpenAI account OpenAI platform. If you don't have an account, you can create one by visiting the OpenAI website.
After logging in, find your OpenAI Dashboard, click on your username at the top right of the screen, then click on API Keys in the drop-down menu.
In the API Keys section, click the Create new secret key button. Follow the directions to generate the key. It's important to remember that your API key is like a password, so treat it as confidential information. Only you should know it and if it falls into the wrong hands, others may be able to use it to access OpenAI's services using your account.
Navigate to Settings -> Billing and add a payment method. Then click Add to credit balance and pre-pay your account.
After you get the API key, you can set it up in the WriterCure app. Open the app and navigate to the settings page. You can set the OpenAI host or a similar host and API key on the settings page of the app.