How to access funds from a fork?
You will need to download a wallet that supports the said fork.

So for example for the "Bitcoin Cash" fork, you will need to download something like this, https://electroncash.org/

Take extreme care when downloading these wallets, as a lot of them are infected/and or malware.

Always check the authenticity of the wallet files you download.

For electronCash they can be found here https://github.com/fyookball/keys-n-hashes