How to read the purchased e-book on tablet side of PE?

I bought a pdf e-book from Entourage web site last Sat.
There is no any problem to open the e-books on the e-ink side.

I find that the 6" e-ink side is too small to view the whole page. (due to my old eyes) The pan & zoom cannot work smoothly. The "pdf reflow" also cannot work well, because some figures cannot be shown.

That 's why I want to view the books on tablet side. But the PE will ask for a password.

I have follows questions:
1) Is it possible to read the purchased books on tablet side?
2) Which password should be entered?
3) How to reset this password, if I forget the password?

Thank you very much