How-To Transfer block.io wallet to Electrum

I have an old wallet from block(dot)io and am trying to transfer what little btc there is onto a new wallet made with Electrum. I have a backup of my private keys but have no idea how to do the transfer. I was able to import the address, but this creates a watching only wallet that from what I read doesn't actually transfer anything? I have 2 keys, which the doc details:"Each address requires two private keys. The first key is BIP32-derived, and the second key is fixed". I have no idea how to use these 2 keys to transfer my wallet. If anyone could help, does anyone have experience doing this transfer?