Manage identities in thunderbird

[Anne Wilson]

As I'm having some gpg problems with kmail I decided to set up thunderbird as 
a fall-back.  Now I want to add identities.  Googling tells me that when I get 
up the properties for an account I should click the Manage Identities button, 
but I don't have such a button.  Does any t'bird user know why?  Thanks

Anne
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