If you want to make the replacement transaction to a different address, you have to remove the unconfirmed transaction from your wallet locally and make the replacement transaction manually.
To do so, disconnect your computer from the internet and after that go to "console tab" and use the following command to remove the transaction you want to be replaced from your wallet.
wallet.adb.remove_transaction("TXID")
Close electrum and open it again. After that, create the replacement transaction manually with the desired fee (it should be high enough, so that it's accepcted by the nodes) and then export the raw transaction and save it.
Connect your computer to the internet and broadcast the replacement transaction using the raw transaction you have saved.