Happy to help! Launch the iPad app, then tap the Gear button in the top of the sidebar. Select "Sync Setup..." from the menu that appears.
That said, if you've got existing data on your Mac, you'll likely want to set up sync there, then have the iPad join in. The easiest thing to do here would be to set up an account on our Sync Server. You can request an account
here.
Once your account is set up, the server will send you an email. Open that up on the Mac and tap the "Set up Sync" link it contains. That will configure your Mac to sync with the server and start sending your existing data. Once the Mac finishes the first sync, open the email on your iPad and tap the link there.