I bought a Trezor hardware wallet and have never used it, but now I need to use it together with Electrum so that I can reuse the same address that I have verified - see https://bitcointalk.org/ index.php?topic=5549192.msg65563515#msg65563515

If possible, please provide guidance on how to sign messages and transactions with the Electrum & Trezor combination, which keys to press on Trezor.