To add the "URL" element, you need to click on the selected item or drag it to the right, then you will see the added element on the right:
When filling in this element, the user must correctly enter the URL address (for example, a link to a profile in a social network, the address of the client's website):
To go to the element settings, click on the "edit" icon:
The "URL address" element settings window opens (you can see the detailed description of each field here):