where do people say that they keep refreshing to try to turn into a zombie?

you need to refresh at the Shadowglen Graveyard.

Click Explore, then click Shadowglen, and just refresh on that main page (that has the links to all the shops/vending/quests/etc).

You can check with the Healer in Riverside to confirm you're infected.

You need to wear a cardboard mask when you go to Shadowglen. Then just keep refreshing until you get the event that you've been attacked by a zombie.