Hi Bsossamon,
There are two ways to do this, the easiest being via the wizard.
1. Click "New" under the Networks on the left-side of the Instant control panel.
2. When you get to step 4 in the wizard, moving the sliding scale on the left-hand side to "Network-based."
3. In the "Access Rules" on the right-hand side, select "New."
4. A popup box will now appear.
5. Under "Rule type," select "Captive Portal"
6. Next, under "Splash Page type," select "External"
7. Under "IP or Hostname," place the address where you've unzipped and installed the Cloudpath instance.
8. Add a "Redirect URL" to your company, school, or business to let the connected user know that they're finished.
I tested this out on an Instant cluster with a Cloudpath instance and it worked as expected.
-Mike