time capsule with 3com officeconnect router

I would like to connect my time capsule to my 3com officeconnect adsl modem router and connect my computers to the wifi provided by the time capsule.

In my 3com admin page I have a bunch of settings for PPPoE.

In order for this work, I understand I should I put my 3com to bridged mode? (how?)

Do I have to re-enter all the PPPoE settings in the mac time capsule utility?

How do I get this to work? The light is currently flashing amber in the TC.

Thank you.