How to adjust brake level movement on hydraulic brake?
Aurigas don't have bite point adjustment. For the most part it's a feature found only on some upper end hydraulic brakes.

The rear brake being a little softer and longer to engage is normal since the line is longer. But if it's more than a little, that can be a sign of other problems that bite point adjustment wouldn't help with anyway, like air in the line or a piston movement problem. If the rear pads are getting worn out that will also contribute.