Hi ionlipca,
You can add new fields by either clicking on the button for the field type you’d like to add, or by dragging it into your form.
If this isn’t working for you, this means you have a plugin or theme on your site that is causing javascript errors. To make sure, you can disable all other plugins and activate a default WordPress theme. If you were having trouble, fields will now be draggable, and it should tell you which plugin has issues.
If you still have questions, can you please open a ticket in our help desk so our team can best assist you?
https://formidableforms.com/new-topic/
Thanks!