From the Form Editor, select the Results button, then click on Export to CSV (top right corner) to download the CSV file containing all form submissions. If you need to export your submissions to Excel, check this article.
In the lightbox that opens type in your email address. By default, the email address associated with your 123 Form Builder account will receive the download. Click on Download CSV and you’ll receive a download link with the CSV file in your inbox.
Make sure that you are logged in the same browser with your email account. Otherwise, you will not be able to access the download link and receive the .csv file containing your form submissions.