How to find the builder address?

Block Builders
1

I deployed Flashbots builder and tested on holesky. Builder is successfully submitting blocks to holesky test net using the falshbots holesky relay. I also implemented a searcher which reads transactions from the public mempool, creates bundles and submits to holesky using the falshbots relay. Now I need my searcher to submit bundles to the builder instead of Relay. Now I have the following issues:

  1. How to find the builder address? Is it http://publickey(FeeRecipietAddress)@localhost:8545? builder http.port=8545
  2. Can I submit transactions bundles to the builder instead of a relay? Thanks.