From Fedora Project Wiki
Download a client-side certificate
| https://admin.fedoraproject.org/accounts/user/gencert |
This is where you can download a client certificate for various buildsystem and packaging access from the Fedora Account System .
You will need to download a certificate in order to use the buildsystem and upload packages. Place it in ~/.fedora.cert, where our various utilities will find it to authenticate you.