Robert11 wrote:
Do I do it at the Verizon phone box on the outside wall of the house ?

Yes - that is the demarcation point where the phone company's
responsibility ends and yours begins.

The exact wiring change is hard to describe without knowing the various
wire colors, etc. that appear at the demarc. Even then it may be tough
to describe. If you are lucky you'll find that the incoming line 2
wires are all on a pair of terminals adjacent to the line 1 wires, and
you can simply move them.