You might want to search the forum first before asking a question. About the username answers can be found here: https://forum.mendix.com/link/questions/9078
and here: https://forum.mendix.com/link/questions/87006
And for the dynamic page name check out this widget: https://appstore.home.mendix.com/link/app/2810/First-Consulting/Dynamic-HTML-Title
Allthough it does not seem to work in Mx7.
Take a look at this question