I use Mac. Pretty much what I need to do is to import my Exodus' private key (which I've already exported) into Electrum only to sign a message, because with Exodus is not possible to sign messages.
But I never did something like this, so I'm trying to understand how to do it without messing up.
So in this case I should create or restore (which one?) a new wallet in Electrum in order to use Exodus' private key?
First, if you don't know how to export your private-key from Exodus:
http://support.exodus.io/knowledge_base/topics/how-can-i-view-my-private-keys-1Go to Electrum -> New Wallet -> Standard Wallet -> Use public or private keys -> Put your private key there and click next.
Now you can just sign your message. You can keep using your wallet on Exodus or use both softwares.