XFi in 2 separate locations, 2 accounts

I just signed up for the XFi advanced security, and was given an option as to which account for the XFi. I picked the first of the list, which happens to be a vacation condo.  I didn't memorize the caci7nt numbers and didn't look them up.  How to I get the XFi security on the system at the other account, my primary residence?