DIFFERENT MESSAGE FOR A SECOND PAGE PROTECTED BY PASSWORD

Hello, I have this problem:

I’ve craeted a private page (A) protected by password for which I wrote the relative message in SETTING—READING

But, if I want to create a new private page (B) protected by a new password for which I need to write a new message, how can I do and where can I write the message (because in setting–reading there is only a field occupied by the message for page (A).

if you need the screenshot I’ll send you via email.

thank you .