Yes the steps are in their documentation:
https://docs.specter.solutions/desktop/
https://docs.specter.solutions/desktop/faq/#how-would-one-sign-with-electrum-do-i-need-to-create-multisig-wallet-in-electrum-first-or-can-i-create-it-with-specter-desktop
But it's more about Specter Desktop, for example you can use your Electrum Coldwallet or Hotwallet as a signature for the Specter Desktop.https://docs.specter.solutions/desktop/
https://docs.specter.solutions/desktop/faq/#how-would-one-sign-with-electrum-do-i-need-to-create-multisig-wallet-in-electrum-first-or-can-i-create-it-with-specter-desktop
What I meant is Specter DIY, it is a HWW and my question was whether I can use this HWW as a signature device with Electrum Desktop.
There's a (small) topic about it: Specter DIY hardware wallet:
Thanks, I'll read through the thread Good thing is that many software wallets including Electrum are supported
Note: I haven't verified this claim.