Invert extruder

I'm working on switching from Sprinter to Repetier, but need some help.
Apparently, I need to invert my extruder direction. The settings I believe are used in Sprinter are:

// For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
#define E_ENABLE_ON 0
// Inverting axis direction
const bool INVERT_E_DIR = true;

I tried inserting these into Repetier but it doesn't seem to invert for me. I've gotten the XYZ axes to work, but not the extruder.
Is there another command or other code I need to include?

Gen 6
Prusa
Stepper motors


Thanks for the specific instructions on how to get it to work with Pronterface. I don't want to switch host SW at the same time as the firmware to make it easier to troubleshoot.

You find thise with the other extruder options in configuration.h

#define EXT0_INVERSE true
#define EXT0_ENABLE_ON false

Yust a modified name for the same thing :-)

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That worked. Thanks for the help. Sorry I didn't find the command earlier.