When you create a new Waffle board, you'll be prompted to set up webhooks to enable real time updates for your board. The red webhooks banner will pop up at the bottom of your board when the project is created.
If you're an administrator within your organization, you can click Create Hooks and you'll be good to go! If you're not admin, you'll need one to log into Waffle and click the Create Hooks button.
If it is a non-organizational repo, the owner can enable webhooks.