Connecting Touch Plate to Xpro & Solid State Relay

Hello, Was wondering if anyone could tell me how to use a touch plate with the Xpro. I am also having a problem with my SS relay. I have connected it to the spindle control on the x pro but non of the state stop commands are working. Im assuming something may have to be configured in GRBL? I have tested the relay with a 9v battery and it worked.

Thanks