OK, first, you need to find the standard binary rpm, not the source rpm. The rpm filename will end in .rpm, not .src.rpm. If you're not used to rpm, then attempting to build one from a source rpm will be too much for now... (if you're interested, check out
http://fedora.redhat.com/docs/drafts/rpm-guide-en/, especially
this ).
Anyway. To install the rpm, type
rpm -Uvh /path/to/mypackagenamehere.rpm
Performing an "U"pgrade will still "i"nstall the rpm if it is not currently installed.
To remove the rpm, type
rpm -e mypackagenamehere
Note that you drop the "rpm" extension when you're dealing with an installed package.
Cheers
ZB