Well, figured it out. From a computer that is hooked into the LAN port on the Obi202, type in http://192.168.10.1
to open the router's web/admin page, with default username, password being admin, admin. Click "router" and then the "lan" section. Click the check box next to router, and it turns into "bridge" (no need to recheck the box). Reboot the router (upper left of the web page says "reboot"). And you're done. Now hook the printer's ethernet cable to the OBi202 LAN port, and then add the printer into your various computers' systems. It shows up very quickly on my Mac's, no problem. This it great because the printer doesn't eat up one of my valuable gigabit ports.
My original issue today was trying to hook into the admin. page from my desktop in another room which was connected to the linksys, and then to the Extreme router, and then to the OBi202. Because that comes from upstream, it doesn't connect to http://192.168.10.1
(no matter how many times you try, don't ask how I know this!). Fix was to connect computer to the LAN port and retry, Bingo!
Once it moves to bridge mode, I'm not sure that http://192.168.10.1
works any more, though I'm not certain.
Thanks for spotting that bridge reference guys. Saved me from explaining to my wife why I needed to move the printer into the living room to be with the Linksys.