I highlighted a very useful Macro for any Feral Druid which allows the player to use Feral Charge in either Cat Form or Bear Form (Depending on what Form they are in) with the same click of a button.
The Macro is as follows:
/cast [stance:1] Feral Charge(Bear Form); [stance:3] Feral Charge(Cat Form)
Go ahead and put those 2 lines into a Macro (The second line may flow into the third line - that's just how it works) and you're all set!
I hope this write-up has helped to add clarification; and, as always, good luck!