For claiming each of fork coins, you need to import your private key into a wallet supporting that fork coin.
The most popular fork coin is bitcoin cash.  The best wallet for accessing your bitcoin cash is electroncash. Download electroncash only from its official website.
Electroncash works same as electrum. You should create a new wallet, select  "Import bitcoin addresses and private keys" and your private key(s).

For more information on how to claim bitcoin cash and other fork coins, you can read the guide provided by LoyceV. (Visit the link below.)

LoyceV's Bitcoin Fork claiming guide (and service)