Adding Signature to Emails

How can I have my default signature automatically added to new emails and replies.  I set it up as directed but can’t get it to work.

In addition to creating the signature, you have to set up the account to use it.

Have you done this?  If you leave the option as “Not Selected” the signature will not appear.

Thank you for your reply.  Yes, I did.  But it does not automatically insert the signature on new emails or replies.  I have to insert it manually each time.