[Elecraft] Problem trying to use Spot on K2

[NR5A]

I guess I don't understand at all how to use the spot feature. For all I
know my K2 may not even have it. I just listened to N0SS 2 different wav
files and still can't figure out what I'm doing.  When I hit the Spot
button, same as Rit only held longer I get SE L  143. The number changes as
I turn the main tuning dial but the tone completly wipes out the signal I'm
listening to, no matter how loud it is. Maybe I need one of those LED Tuners
I've been reading about. What am I doing wrong??

Jerry - NR5A - South Dakota