Yes, well you need to know which pins on the 25-way connector on the BoB go to where and configure Mach3 accordingly.  Without that it will be hard to make any progress.  Where are you located?

Which "Reset" button won't reset - the one on the Mach3 screen?

try to start with a simple setup. only e-stop and axis outputs.

in here:
https://www.machsupport.com/wp-content/uploads/2013/02/Mach3Mill_Install_Config.pdf

is a step by step description.