CMS Made Simple Forums

I have CMSMS 1.11.6 installed on my localhost with FEU 1.21.15

I created 2 user properties (username and password). I then created a group, a user and associated my two user properties for the group.

I then clicked on settings -> Builtin Authentication and see that it has an option to allow duplicate emails. I clicked yes.

I then try to save, but I get a warning that says...

The following settings are only applicable if using the "Builtin Authentication".

How do I apply?

Thanks

You need to set that, there should be 2 tabs on that page and IIRC the first one is where it is set...