how to claim super bitcoin from Electrum Wallet?
Are you talking about this? ->
http://supersmartbitcoin.com/The fork will be on 498888, so you will need to wait a bit longer, as we are currently at 499277.
-edit- I'm blind. Fork has already happend it seems, try to find a compatible wallet and do as described below.
Then you will simply need to import the private key of your current adress holding the bitcoin into a forked wallet, ( Like electron cash, but for superbitcoin), and you should be able to claim it.