To change the share URL from the default one provided by UpViral (ex. upvir.al or sociali.io), follow these steps below.
Step 1 - First, make sure that you've set up your custom domain properly. Here's an article on this: https://support.upviral.com/support/solutions/articles/4000160262-how-to-check-whether-your-custom-domain-set-up-and-ssl-is-working
Step 2 - Once your custom domain has been set up, go to the campaign you wish to edit and click on "Advanced".
Step 3 - On this page, click on "Edit" under Referral Tracking Domain.
Step 4 - As long as you've added your custom domain with the SSL successfully installed, you can select your custom domain from the dropdown menu.
Step 5 - Hit save. The URL that your participants share with their friends will now appear as your custom domain.