Hi Paul,
Actually, the BBcode should work in sigs. Here is my sig code as an example:
Get "The Bare Naked Profit Model" report free
by subscribing to {url=http://www.marketingauction.com} "The Missing Link" newsletter!{/url}
Note that I've used {} instead of [] so the code wouldn't work.
BTW, welcome to Lynn's Place!
Hope that helps...
Becky