Do not enter protected health information. Leave out names, dates of birth, addresses, phone numbers, medical record and insurance numbers, and anything else that could identify a patient. Describe the case, not the person — the output is just as good.
This is a free tool on a public page. There is no BAA covering what you type into it, and no chart to attach it to. Everything it generates is a draft for a clinician to review, not a clinical record.