OK, let’s start over. If you want someone here to help you figure this out, please start by sharing the exact URL link that you are launching when you try to log in to “a Samsung account”. Every website that has problems with autofill has unique issues, so unless we know the specific website you are asking about, it will be difficult to impossible to help.
Also, while waiting for someone to help, please review the learning resources about custom fields that available here: