Adding a wallet to NODE40 Balance simply means you are uploading the transactions from that wallet. It is important to note that transaction data does not expose any of your private keys and is safe to import to NODE40 Balance.
With your Electrum wallet open select Wallet => History => Export.
- Select the default CSV export Format.
- Take note of where the *.csv file will be saved to.
- Click the Export button.
You now have a file ready for import into NODE40 Balance.
Note:the first time you create a new Ledger in NODE40 Balance for the Electrum wallet, you will also need to export your xPub key.