free email certificate

I got a free email certificate from comodo, then I downloaded it using the link sent to me.
I used safari and firefox, but both don’t install the certificate il the wallet.
I double clicked on the downloaded cert and the cert is now in the wallet but not as private cert.
No way to use this certificate?

nobody can help me?

I see in the forum they are other with same problem (i.e. but there is no visibility on solutions

it seems there is no way to login to (for free users at least)

I posted an issue to support