Associated input

An associated profile field, associates its value with a core optional profile field.
Ever wondered how to include a core optional profile field on the signup page? Or how to make that field a required field? Or even how to prevent users from providing a non-unique value for it?
The associated profile field is the answer to your need. You can define an associated profile field and “associate” it with a core profile field.
If this plugin makes your life easier, you can treat me a coffee