PS: I tried just creating a new module, but when I go to select a list to automatically subscribe a new subscriber to, a popup appears that shows my backend and there is no way to select a list. Here is a screenshot of what appears when I click on "Selection" next to "Automatically subscribe to"
Meanwhile in the front end, I get an error message saying that I have not selected a list for the module.
Fortunately, my current subscription forms are still working, but why can't I edit them or create a new one?