I agree to the terms provided by the form.

Code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script>var jQ = $.noConflict(true);
// version 1
jQ(document).ready(function () {
//jQ("#item15").hide();
jQ("input[name='do_you_agree[]']").on('click', function() {

if (this.checked) {

jQ("textarea[name='agree_text']").val("LIABILITY\nCUSTOMER understands that Spirit Massage requires Professional Liability Insurance Coverage for each of its subcontractors and will provide detailed policy information & verification of said coverage to CUSTOMER upon request.\nINDEMNITY\nCUSTOMER agrees, to indemnify and hold Spirit Massage, harmless from any claim, loss, cost, expense, demand, or damage, arising directly or indirectly out of the use of its on-site services and activities in connection therewith.\nNON-SOLICITATION\nCUSTOMER agrees not to solicit agents, subcontractors or representatives of Spirit Massage directly for employment, contract or otherwise.\nPAYMENT\nFor the initial engagement, CUSTOMER agrees to supply a valid credit card to secure the booking and to submit payment on or before the date of service. For all subsequent engagements, CUSTOMER agrees to submit payment on a NET30 basis (30 days after invoice.) Payment is accepted by check or major credit card.\nCANCELLATIONS\nNo refunds will be provided for deposits or cancellations received less than 24 hours before a scheduled appointment. Cancellations received between 72 and 48 hours before a scheduled appointment are eligible for a 75% refund, and cancellations received less than 48 hours before a scheduled appointment are eligible for a 50% refund. Additionally, events with 5 or more therapists that have been booked and confirmed, will incur a 10% non-refundable fee for any cancellation or change, at any time.\n");
}else{
jQ("input[name='agree_text']").val("");

}
});
});</script>

Copy the above code to an HTML element. Change the name of the inputs in my code to match yours. If you don't use a checkbox like I did remove the [] to the right of the checkbox input name in the two spots it's used.