Nodered_pfc8574 addresses too restrictive in UI settings

I am a noob tying to use https://flows.nodered.org/node/nodered_pfc8574 to control 3 relay boards but the addresses are 0x14, 0x15, 0x16 not 0x38 & 0x39 that the UI settings allow to be set from the drop down combo box. Is it possible to edit the address in a text file somewhere outside node-red so that I can set the addresses I need? but also so I can have 3 off pcf8574chip nodes in the system?
Thanks,
Aaron