If you scroll down to the very bottom of the page, you will see a line of different "Sections" (Home, About, Media etc.) Click on "Account", and log in with your log in credentials provided to you. That being your email, and the password you have received from the BM team through an email. Somewhere on that page you will see your "Pledge Tier". Mine for instance, say's "Digital Collection Tier".
If you have any problems regarding this, you could possibly send a PM to one of the devs themselves, or send an email to
[email protected]. At least that's what i would do if i had problems regarding this subject.