Just put your ETH address like this: https://hex.win/?r=YourETHaddress Visitors to the URL will have the referring address set in their cookies on their browser where they can be pulled up by the claim tool when they claim. You can test this cookie being set by checking the cookies in your browser. For instance, in chrome: Inspect Element -> Application -> Cookies. Which means click the ref link you made. Right click some blank spot on the page. Left click inspect. Click the two right arrows in the top right to expose the "Application" drop down. Left click it. Left click the arrow next to "cookies" in the bottom of storage. Left click the HEX url. On the right you will see a cookie named "r" next to it you will see "Value" it should equal the ETH address you entered in the URL that you created and clicked to test.