How to get my 5v relay to turn on and on

Hello
It has been a while since I have posted
My setup is working very well, thanks to everyone for their help
I am trying to upgrade a little
So, my setup is using MACH3 and a TB6560-V2.5 control board. It is a cheap 3 axis board from China, but it works for me
On the board are connections for 4 limit switches, and beside these are 2 connections for 5VDC pos & neg relay. I thought these might control on/off for a spindle, but no luck. I don't know if I have a settling wrong or a wrong code.
I have set MACH3 as follows: Output Signal, Enable 1, port 1, pin 1, active low checked
Output 1, port 1 pin 14, active low not checked
Spindle Setup, Relay enabled, both Outputs # 1
In my software I have tried M3 & M5
I only want to turn this 5 v relay on & off with the software.
Any suggestions would be great
Thanks & Cheers
Steve