Extract the ZIP to some location and
open Marlin-bugfix-2.0.x\Marlin\Marlin.ino in Arduino IDE (recommended v1.9.0 BETA)
Go to Configuration.h file
Find and replace each of the follwing with these settings
Note: DEFAULT_AXIS_STEPS_PER_UNIT 96 is the E-Steps after E-Step tuning
Note: There are 2 locations for the REPRAP Graphics, you only need to uncomment the one listed below, not both
Upload to your Rambo 1.4 and test it.
Adjust to your liking.
Make sure that all your axis positions are in the center
incase something happens and you have to power off quickly.
Be prepared for anything.
If motors are not running in correct direction,
(Power Off the Power Supply first or you could fry the board)
turn the pins around on the board, don't try to fix it in firmware
(ie. inverting axis) there is no reason to do that.
Note: Y Axis will move towards you on the positive (up) moves,
and away from you on the negative (down) moves.
I have tried to work around this, but doing so makes all the prints
corrdinates at the bottom left rather than the top left where they should be.
Maybe it can be done so that it is truly proper, but i have no idea how.
I gave up after making all the change I could in Configuration.h Y_HOME_DIR etc.
I have found it's not such a big deal after a while, you get used to it.
Then we will fine tune our printing in our software.
I use Simplify3D, the settings will be similar in other software.
However, they will use different terms and names respectivly.