After publishing your campaign, you will see a switch labeled "Shareable Popup Link" on the modal that appears. By using this switch, you can make your popup accessible through a unique link, allowing your forms to be filled out via this link.
When you turn on the switch, there will be a brief build process, after which your unique link will be available for copying.
By navigating to the link in your browser, you can now open and fill out your form.
If you want to disable access to this link, simply return to the publish step of your campaign and turn off the "Shareable Popup Link" switch from the left menu.