Setting Up Multiple Signatures In Windows Mail

I have tried unsuccessfully to set up different signatures for the five email addresses I use. These addresses are used for five different interests. However I try I still get the signature for the default address whenever I click "Create Mail." The default email address is shown,with the default signature. When I change the outgoing email address in the address bar the signature shown is still the same. So I tried to use the Insert feature by unticking "always use signature etc" and clicking "insert" on the toolbar of the message. However the option to add signature is always greyed out.