Thank you for fast reply Anke , I'll try...
I remember that is more professional had a package for example: com.developer.appname and is better for the user experience to climb positions in the rankings on playstore.
However , I'll try...
I know how works it... but I have no read any new solution compared to the past.
I just showed an example in my screenshots. You can change the packageName to whatever you want.
Yes, thanks, bye.
I solved with ai2 offline and I easily changed the package.