1. Open your account here: http://cevo.com/xapo/
2. Follow the steps to login to your Xapo account (if you don't have one, you can create it here: http://xapo.com/r/7H6MELU)
3. Authorize Cevo
4. ENTER THIS REF. CODE: c0ZQWjRoR2FsT2pURENqSm9NZHBlTmNzVGplaERieGh2Z04xTUw4MHlXQT0
And that's it. You can open a vault and earn some BTC.
More about this partnership program here, on the oficial Xapo blog: https://blog.xapo.com/xapo-launches-gaming-cevo-leetcoin/