When you tap on the More section, you should see the Store where you can purchase the style pack.
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Are the new jazz styles available only within v6 of the app?
I'm using a 1st gen iPad running iOS 5.1.1. It's running v5.1 of iRealPro (last compatible version) and Settings doesn't show the new styles in the 'store' section. There doesn't seem to be a 'more' section to tap.
I like the new editor in version 6.0.1. No more having to remember to capitalize the first letter of the chord; no more drop-down menu for the many chord types as everything is on the keyboard. Separate (and large) keyboards for text entry and symbols. Really sweet…nice improvement of the app.