If you would like to only allow an entry to be edited once, we can compare the updated and the creation dates. If they are different, the entry has already been edited. In order for this to work, you should enable editing in your form settings, and this code will prevent the editing. Keep in mind editing could also be done automatically

Use [25 shortcode=1] To display individual links for each field option selected from a checkbox field.

Use this code to populate a dropdown, checkbox field, or radio button field with the titles of all the posts on your site.