A site is telling me that i have no digital certificate installed....

Question

Hi. Trying to access a page on the Spanish version of the IRS, to file a tax document here. I can't get access to the page (or any of their secure pages), and I get this message, which has been Google translated:
''The error "403 byrule" is a mistaken identity. Occurs when you try to access an option that requires electronic certificate and the browser does not detect that one is installed or not properly selected. If the choice of the certificate you get a page that says "page can not be displayed" or similar error is possible that the certificate is damaged, changes or problems in the operating system or other causes. If possible, you should try to reinstall a valid copy of your certificate.
This error in Firefox indicates that there is no digital certificate installed. Go to "Tools" "Options" ("Firefox", "Preferences" Mac "Edit" "Preferences" in Linux), "Advanced" and select the "Encryption". Click on the "View Certificates" and verify that your certificate is installed correctly. If no certificate on the tab "Your Certificates" will have to import a valid copy of the browser. If necessary, also refer to the instructions on importing certificates from our "Help" and the links that we propose below. Once the certificate is installed also make sure that Mozilla Firefox is configured correctly. This may refer to the "Installation, configuration and management of electronic certificates for Mozilla Firefox.''
Under "view certificates" in preferences/encryption, "Your Certificates" is blank. And I don't see anything in "Authorities" that seems to relate to this website. In 'Servers" there were some exceptions I created (reluctantly) when the site asked for it. I deleted them, still not working."
I've tried with both "Select one automatically" and "Ask me every time"
Click on the page below, click on any of the links with a lock to see the resulting error.
Thanks in advance.

Answer 1

Thanks. You are very much on the right track, and I can't thank you enough. The page you sent me to is has the right link. But I can't just download the certificate, as you proposed. It's actually part of a significant security system. I went to the webpage that accompanied the link. I have to fill out a form, from that get a code... then go to a local gov't office, show my ID, get another code, then come back, input that, and get my personalized certificate. I'll let you know how it goes. But without you I have no idea how I'd even have gotten onto the right path. Thanks again.