Layer 2 bridge questions

We recently purchased Balance devices for our headquarters and two remote sites and with the help of @MartinLangmaid in this thread configured a SpeedFusion profile and L3 site-to-site VPN that balances traffic across a few links.

Now I need to add another remote site but, this time connected via an L2 bridge. I read the KB article and a few posts here on the forum but, can’t seem to wrap my head around the process.

At our HQ I have two Ethernet connection going to the Balance 710. Port LAN1 is the traffic for our first remote site. Port LAN2 is the traffic for our second remote site. That’s about as far as I’ve gotten, I can’t figure out how to associate the existing SpeedFusion profile or a new SpeedFusion profile with the LAN2 port that should be L2 bridged to our second remote site.

Where should I begin? What additional info can I provide here to help in setup and troubleshooting.

Thank you!