Reply to the person you'd like to tip and include 'u/chaintip' within the reply.
Chaintip will send you a private message letting you know which address to send Bitcoin Cash to.
Receive a private message from chaintip about some Bitcoin Cash you've received.
Download a Bitcoin Cash wallet.
Click "Receive" on your wallet to obtain your receiving address.
Reply to the private message from chaintip or message chaintip including only the Bitcoin Cash receiving address.