How do I change the frequency to 433Mhz for use with Omnipod?

I'm using Omnipod in the US.  On the Loop websites there's a screenshot of the settings page and it shows 433MHz - how do I do make that change?

Out of interest, my (home-built) RileyLink is working just fine with the Omnipod with it set at 916MHz so maybe I don't need to bother...?