It is important to share the correct URL for a Formstack form; we learned the hard way that sharing the wrong one can mean that the application never notifies staff members when a form is submitted.
The first step is to determine whether the form is a plain Form or part of a Workflow. If it is part of a Workflow, there will be a Workflow with an appropriate name. You can then go into the Workflow Builder and see that it references the Form:

If it is part of a Workflow, then you want to share the URL for the Workflow. The hostname should be copilot.formstack.com. You can get to it by going to the Details for the Workflow and scrolling down:

If you determine that the form is standalone and not part of a Workflow, you can go to the General/Basic Settings for that Form and find the URL there:
