Mention @chaintip anywhere in your reply to the tweet you want to tip.
@chaintip will tweet you letting you know which address to send Bitcoin Cash to.
Use a mobile phone or other wallet to send Bitcoin Cash to the address.
Receive a notification from chaintip about some Bitcoin Cash you've received.
Download a Bitcoin Cash wallet. Click "Receive" on your wallet to obtain your receiving address.
Follow the instructions in the tweet and link your receiving address by sending it as a direct message to @chaintip.