Unable to set HOME on Atomstack

I’m totally new. I have an Atomstack A5 PRO. When I turn on the power, the laser lights up and it immediately goes to the lower left corner. This model has no limit switches, so it will set there and grind away. I kill power right away, but am unable to perform anything with the software because it can’t communicate with the machine.
I sure hope there is a simple answer for this.