At the moment, this can be done only on the Tempting Giveaway, the Leaderboard Giveaway, and the Startup Prelaunch templates, where the unique link takes by default, the domain of the URL where you're going to host your campaign.
Also, you can edit your unique referral link at the newsletter template!
You can easily do this at the "referral dashboard" step in the campaign wizard, just click on the change Page URL and follow the instructions for adding a custom domain.
All the other templates have a vrlps.co domain and it cannot be changed.
Let us know if you need any further help! 😊