There are also a massive amount of guides online which will help, makesure to follow them to the teeth.
https://cryptocurrencyfacts.com/how-to-get-forked-coins-from-bitcoin-forks/
He already said that he moved the coins from that address to the ledger nano s. I don't know the ledger btc split tool, but I'm assuming it's a tool that's meant to be used to claim coins from ledger addresses and not from electrum, and that is probably why the OP is having trouble.
Like I said before he needs to claim the coins from the electrum address. Anyway, if you put any more coins on that address, do remove them for safety reasons. Also, since you will be giving away your pk from that address, I suggest you to never use it again after claiming your coins.