1. Sign up for an account on RapidAPI, if you do not already have one.
2. Navigate to the AdGuru API page on the RapidAPI website.
3. Click on the “Subscribe” button to subscribe to the AdGuru API.
4. Once subscribed, click on the “Test Endpoint” button to test the API.
5. In the “Test Endpoint” section, enter the product name for which you want to generate an advertisement copy.
6. Click the “Test Function” button to make a request to the API.
7. The API will respond with a generated advertisement copy for the product you entered.
8. You can use this generated advertisement copy in your marketing materials or campaigns.
9. If you need to generate ad copy for another product, simply repeat the process starting from step 5.

This is just a basic tutorial on how to use the AdGuru API. Depending on the specific implementation, there may be other steps or options available for using the API. Be sure to refer to the API documentation for more information.