Enable sigure in Mail

[Chris Gilland]

I've set up a signature in Mail, and it does show up as Chris's sig, in the 
table in preferences, under signatures, but the use signature none popup 
menu button, is dimmed.  I mean it's there, I just for whatever reason can't 
get it to be active.  I was wonderring what I have to do in order to set 
this so it'll be active.  The table before that has two things in it.  All 
Signatures, or pop.  When I was navigating, that table was set to all 
signatures.  Should I have interacted and dropped that down to pop?

Slightly confused.  I'd be interested to know how to fix this.
Chris.