TAZ 6 FLEXYDUALLY - Using only the rear extruder

I’m having difficulty finding a way to only use the rear extruder on my flexydually. Can someone please let me know how this can be achieved. I’m using Cura, Lulzbot edition.

When I load in the rocktopus and press print, it stops after the following lines:

< Probing done!
< echo:Active Extruder: 1
< echo:Active Extruder: 0

I tried setting the extruder nozzle temp at 0C, that did not work.
I tried setting the extruder nozzle temp at 200C, that did not work.
It still stopped or gave me an error.

Thanks.

Update:

My printer was not starting prints after leveling because it was waiting for the bed to heat to the set degree. The bed was not heating up all the way.
I called lulzbot and they told me what to check to see what was wrong with the print bed.

  1. I Checked the resistance between the 2 red wires on the left side of the print bed.

  2. I Checked the resistance between the 2 white wires on the left side of the print bed.
    They were both reading correctly so the bed was not broken.

  3. I opened the left panel to see the inner circuitry and checked the 15 amp blue ato fuse.
    I took that out. It was not blown. I firmly placed it back in.

When I started a print again, the bed heated up to set temperature and the printer was able to follow through the process and work correctly!