Just type the following at the command line:
Code:
$ sudo rpm -ivh <path_to_rpm_file>
Replace <path_to_rpm_file> with the location of your rpm file. If that doesn't work, then try typing
Code:
$ su
# rpm -ivh <path_to_rpm_file>
# su <your_normal_username>
Of course, replace <your_normal_username> with your nonprivileged user account.
Also note that if you use a non-rpm distribution, you won't be able to install rpm files. You'd have to use your appropriate package manager.