When I open the Keychain icon, I don't see any Import/Export menu item. There is a menu button, and when I open that I see Add Account, Manage Accounts, Change Password, Preferences, Autolock, and Keychainify. There's a mention of your support proposal below those choices.

I appreciate your personal kind attention, and have been awaiting some response, as I am baffled, and unable to proceed without it.

Thanks!