Getting the + to show in Firefox

I have the Key icon in the Firefox tool bar. When I go to a new web page that requires a signon the key icon is showing in the user name and the password. I type in the new user name and password. I click on the key icon on the tool bar. It brings up a menu with a search bar. I don’t see a Plus sign to click on. I have Keypass running. It doesn’t add the new web page, new user name and password to keypass. In Keypass, Tools, Plugins I do see the Key plugin. How can I get Key to add the signon information to Keypass?