"no key"

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http://forums.fedoraforum.org – Hello to all, I have possibly a trivial question. I am new to fedora and relatively to linux, and during my installation of fedora 18, i updated all necessary libraries and files, but after finalizing the definite shape of my new distribution (flash, google talk plugin, etc. ), I put : yum update and received: warning: /var/cache/yum/x86_64/18/rpmfusion-free/packages/rpmfusion-free-release-18-0.4.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID 982e0a7c: NOKEY Public key for rpmfusion-free-release-18-0.4.noarch.rpm is not installed (1/5): rpmfusion-free-release-18-0.4.noarch.rpm (HowTos)