To access the flipbook journals once you are logged into your BSG profile go to 'journals' at the top of the page. On that page choose Gut or FG for the flipbooks, you will see the password which if you cut and paste this will take you to GUT and FG flipbook version you do not need it for the online version.
This is written under the logo; To access the Flipping Book Edition of Gut, please use the following Member Password after launching: Zvb01TIgHH8lK7q It is the same for FG.