I realize this is an older post, but wanted to add to it for future viewers/reference.
I agree with Melania that the Settings is the place to put login/logout information (as in an Accounts entry point, much like the email app).
Having said that, the Xbox app has the login/logout information shown in a box in the upper right corner. It works for that app, but not all apps. So look at your user scenario and determine if it makes sense to put that "chrome" on your canvas (does the
user login/logout a lot?!?) or in the Settings (set once and leave alone).
Regards,
Christine