PrivateMemberData can't be link to other Database

Hi Oscar Aveline.

Thanks for your reply! I appreciate it. Regarding the link that you have just shared to me, I already read it before. I just don’t know what additional code to put in my existing code wherein after filling out the form for signing up like the person’s first and last name, email address, and password, and by clicking the register button, those values that are being put there by the current user, should not only be saved in “Members/PrivateMemberData” but also saved in my other database which I created.
Hope you understand what I mean