first remove the "./" from this
Code:
yum reinstall ./rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
then remove the rest that is not needed
Code:
su -
-- password---
cd /to/the/location/you/saved/it
yum install rpmforge-release
also unless you HAVE a paid for and required support contract with redhat and have registered your install you CAN NOT INSTALL UPDATES