Chat GPT Confusion

While playing with Lojban I got a message that I had the ability to use ChatGPT to define up to 30 words a month and it offered me the opportunity to explain the sentence I was looking at. I selected yes and it gave me a nice explanation, but that was it. The option never showed up again for any other Lojban question and never appeared for any of the other languages I am studying. I like this feature. How do I use it? Please explain how I get it to work on sentences I select. Thanks.